Introduction to the Radius and Ulna Bones Anatomy. Distal radius fractures are one of the most common types of bone fractures. The radius bone is shorter than the ulna and is prism-shaped long bone. Extensor pollicis brevis (EPB) comes up from lower part of this surface. These are long bones, short bones, flat bones, irregular bones, and sesamoid bones. The head is disc shaped and articulates above along with the capitulum of humerus. Which of the following is NOT a landmark located on the proximal radius? This makes the radius move in the opposite direction of the pronator muscles, moving the distal end of the radius back to its position on the lateral side of the wrist. It is one of the two bones of the forearm, the other being the ulna. Bone type: One of the four basic bone shapes in the human skeleton. 8. The radius and the ulna constitute as the bones of the forearm.The antebrachial region, as it is clinically known, spans the length of the region which extends roughly from elbow to wrist. Long bones of the leg include the femur, tibia, fibula, metatarsals, and phalanges. The upper arm bone is names the humerus. In the image below pink color represents the origin and blue color represents the insertion of the muscles to the radius bone. In fact, the radius is the most commonly broken bone in the arm. Abductor pollicis longus (APL) comes up from the middle one-third of this surface. Falls are the main cause of distal radius fractures. The skeleton of the arms and legs are made up of mostly long bones. There may be subluxation or dislocation of distal end of ulna, because of defective development of distal radial epiphysis. The radius is longer than it is wide, which makes it a long bone. This kind of fracture is very common. It begins at the lateral side of the elbow and goes to the thumb side of the wrist. Short bone. The radius is a long bone in the forearm. The radius bone (os radius) supports the lateral (thumb) side of the forearm and the ulna bone (os ulna) supports the medial (little finger) side. A forearm fracture occurs when there is a fracture of one or both of the bones of the forearm. The lower end of the radius bone is the widest part and provides five surfaces. The bones of the lower arms are the radius and ulna. The radius runs alongside the ulna, the other long bone of the lower arm between the elbow and the wrist. The posterior border of the shaft of the radius bone is well-defined only in its middle third of the shaft. The most common type of fracture is a break of the radius bone, a long forearm bone. the occipital bone is located where? What type of bone is the radius? the radius and this bone "cross" during pronation. However, bowing fractures of all long bones have been described. Radius, in anatomy, the outer of the two bones of the forearm when viewed with the palm facing forward. The radial distal 1/10 site has abundant spongy bone and teriparatide is known to increase the bone mass of spongy bone instead of cortical bone . clavicle. In traumatic injuries, the distal radius … Sometimes an additional center is found in the radial tuberosity, which appears around 13th or 15th year. There are 5 types of bones in the human body. The forearm contains two major bones. Each part is discussed below separately. The end of the arm towards the wrist is called the distal end. It is instrumental in the shaping and use of hands. The radial "head" is the knobby end of the bone, where it meets your elbow. Above it runs upwards and medially to the radial tuberosity and makes the. Long bones are mostly located in the appendicular skeleton and include bones in the lower limbs (the tibia , fibula , femur , metatarsals , and phalanges ) and bones in the upper limbs (the humerus , radius, ulna , metacarpals , and phalanges ). A small synovial bursa covers its smooth anterior part and separates it from the biceps tendon. Sometimes, the ulna bone in the forearm is also broken, called a distal ulna fracture. The long shaft of the radius bone provides a lateral convexity extending between the upper and lower ends. The radius bone is homologous to the medial bone of the leg, tibia. What type of bone is the radius bone? a. Its anterior oblique line provides origin to radial head of flexor digitorum superficial (FDS). The lateral surface projects distally as the styloid process. Healthline Media does not provide medical advice, diagnosis, or treatment. In fracture shaft of radius bone, with fracture line below the insertion of biceps and above the insertion of pronator teres the upper fragment is supinated by supinator and lower fragment is pronated by the pronator teres. Hence you can not start it again. The radius helps us to rotate our arm. There are five types of bones in the skeleton, these are flat bone, long bone, short bone, irregular bone, and sesamoid bone. The radius articulates in four places: Elbow joint – Partly formed by an articulation between the head of the radius, and the capitulum of the humerus. It broadens towards the distal end and is concave anteriorly in its distal part. All land vertebrates have this bone. The secondary centers are for both upper end and lower end of the radius bone. The upper epiphysis merges at the age of 12 years. Which Muscles Attaches To The Radius Bone? The lower epiphysis merges at the age of 20th year. In concert with each other, the two bones play a vital role in how the forearm rotates. Other muscle attachments include the supinator, the flexor digitorum superficialis, the flexor pollicis longus, the pronator quadratus, and many more tendons and ligaments. What are the Different Types of Distal Radius Fractures? One is the ulna, and the other is the radius. It is most commonly broken from an impact on the hand, such as occurs in a fall - whether that fall is from standing height, a ladder or a motorbike. Madelung deformity: It is a congenital defect of radius bone which provides the following clinical features: The anterior bowing of distal end of radius bone, as a result of an abnormal growth of distal epiphysis. The brachioradialis is inserted to the base of styloid process and radial collateral ligament of wrist joint is connected to the tip of styloid process. In this blog, orthopedic physicians Dr. Ather Mirza and Dr. Justin Mirza of Mirza Orthopedics outline the different types of distal radius fractures and explain how the type of fracture affects the treatment needed. The biceps originate near the shoulder joint and insert into the radial tuberosity on the upper part of the radius, near the elbow joint. The head of the radius bone is formed like a disc and in living it is covered by an articular hyaline cartilage. You have already completed the quiz before. The ulna primarily connects with the humerus at the elbow joint, while the radius primarily junctions with the carpal bones of the hand at the wrist joint. The upper part of this border is referred to as. Copyright 2016 - 2019 Earth's Lab All Rights Reserved -. In a Colles fracture, in which direction is the distal radius displaced? In over two thousand bone lesions there were but 56 cases in which the lesion was found in the radius, and of these, 50 were in the lower end, representing about 90 per cent of the cases. Radius and Humerus: The radius and the humerus are two long bones found in the arm. Our website services, content, and products are for informational purposes only. Posterior surface: The posterior surface of the lower end of the radius bone provides the dorsal tubercle of Lister lateral to the groove for the tendon of extensor pollicis longus. The radial tuberosity serves as an attachment point for which muscle? Fracture of styloid process of radius bone is termed ’Chauffeur’s fracture’. In the accompanying table, the relative frequency of the different types of bone lesions found in the lower end of the radius is compared to the total number of lesions of each different type. You have to finish following quiz, to start this quiz: Which of the following bones does the radius not articulate with? The answer is C, long bone. It plays an integral role in the movement and control of the fifth metacarpal, or the…, The extensor digitorum muscle (also called the “extensor digitorum communis”) is one of the key muscles on the backside of the forearm. Tendon directly medial to dorsal (Lister’s) tubercle of radius? The distal radius is the end (distal) portion of the forearm bone (radius). Its sharpest interosseous border is located on the medial side. Biceps tendon is inserted to radial tuberosity’s rough, posterior part. Below the head is the neck, which is the constricted part. In humans it is shorter than the other bone of the forearm, the ulna. The Bayne and Klug classification discriminates four different types of radial dysplasia. The function of long bone is to support the weight of the body and facilitate movement. describing a radial dysplasia with participation of the humerus. The radius and ulna are the most commonly affected bones, followed by the fibula. Through the groove medial to groove for extensor pollicis longus passes tendons of extensor digitorum and extensor indicis. a. the radius is the smaller bone in the forearm, and the fibula is the smaller bone in the leg. ulna. Interosseous membrane is connected to its lower three- fourth. It occurs between 10 and 14 years of age. All the major bones of the arms, including the radius bone are long bones. In concert with each other, the two bones play a vital role in how the forearm rotates. Save A distal radial fracture, commonly referred to as a wrist fracture, occurs when there is a break in the radius bone. In fracture at the distal end of the radius bone. The circumference of head is smooth and articulates medially along with the radial notch of ulna, rest of it is surrounded by the annular ligament. compact. It articulates superiorly along with capitulum to create humero-radial articulation. The radius bone is made up of three parts, upper end, lower end and a shaft. If you hold your arms at your side with your palms facing up, the ulna is the bone closest to your body and the radius is closest to your thumb. The radius is lateral and the ulna is medial. All rights reserved. Pronator teres is inserted on the rough area in the most convex middle part of this surface. Lateral surface: The lateral surface of the lower end of the radius bone projects downward as the styloid process and is associated to tendons of adductor pollicis longus and extensor pollicis brevis. It is one of the two bones of the forearm, the other being the ulna . long slender bone that articultes with both the sternum and the scapula. Here we outline the different types of bones in the human body and explain where they are found. Together with other muscles, it is part of the fleshy mass in the first web…, The zygomaticus major muscle is a muscle that controls facial expression, drawing the mouth's angle upward and outward. The neck of the radius bone is the constricted part just below the head and is embraced by the lower part of annular ligament. What landmark on the radius articulates with the distal ulna? Long bones are so-called because they are longer than they are wide. Also, dislocation issues with both the wrist and the elbow may arise. Radius Anatomy: radius is a curved bone with an apex lateral bow with an apex lateral bow; cylindral in the proximal third, triangular in the middle third, and flat distally ; radius & ulna lie parallel to each other when forearm is supinated; Flexor pollicis longus emerges from its upper two-fourth. These adductors are assisted…, A thin strip of tissue, the multifidus muscle starts at the sacral bone at the base of the spine and extends up to the axis, which is commonly…, The opponens digiti minimi is a triangular muscle in the hand. The larger of the two bones of the forearm is known as radius. The lateral bone of the forearm that is located between the elbow and the hand and that is always aligned with the thumb is called the radius bone. What is the Anatomical Position of the Radius Bone? What Are The Various Parts of The Radius Bone? The carpal bones articulating with the radius are? Anatomy associated with distal radius fractures is the: radioulnar joint, the sigmoid notch, lunate fossa, the scaphoid fossa, and the ridge between the two fossa. They occur at the end of the radius bone near the wrist. The radius is the lateral of the two bones, which makes the ulna the medial bone of the forearm. The adductor hallucis is a two-headed muscle that is responsible for flexing and contracting the big toe, and reinforcing the arch of the foot. Both bones are important for proper motion of the elbow and wrist joints, and both bones serve as important attachments to muscles of the upper extremity. Which muscle attaches to the lateral surface of the radius? Most of the bones in the upper and lower extremities are long bones, except for the tarsals and carpals. Due to the human instinct to break a fall by outstretching the arms, the radius is one of the more frequently fractured bones in the body. A fracture in this area typically causes pain on the outside of the elbow, swelling, and the inability to turn your forearm. base of the … The radius transmits up to 80% of the forces across the wrist to the forearm. In order to determine the proportion of trabecular and cortical bone at these sites, we ashed and weighed the cortical and trabecular bone from 2-mm thick sections spaced approximately 2.5 mm apart in the most distal 12 cm of radii and ulnae from four women aged 21, 43, 63, and 85 years. The radial tuberosity is just below the medial portion of the neck. The medical term for "broken bone" is fracture. Nutrient foramen appears a little above the middle of this surface in its upper part. It also provides grooves for other extensor tendons. Supinator is inserted on the widened upper one-third of this surface. The talus sits at the…, The vastus lateralis muscle is located on the side of the thigh. d. Sesamoid bone. The forearm contains two major bones. A fifth type was added by Goldfarb et al. It extends above up to radial tuberosity and below its lower part forms the posterior margin of the small triangular area on the medial side of the lower end of the bone. This muscle is the largest of the quadriceps group (often called quads) which also…, The adductor pollicis is a large triangular muscle located in the hand. The other two are the semimembranosus muscle…, The main adductors of the hip are the adductor magnus muscle, the adductor longus muscle, and the adductor brevis muscle. The two bones of the forearm are the radius and the ulna. Anterior surface: The anterior surface of the lower end of the radius bone provides a thick ridge, which provides connection to palmar radio-carpal ligament of wrist joint. The groove lateral to the Lister’s tubercle is traversed by tendons of extensor carpi radialis longus (ECRL) and extensor carpi radialis brevis (ECRB). © 2005-2020 Healthline Media a Red Ventures Company. These injuries usually occur in children although adolescents may be affected. Radius. The major bones of the arms (humerus, radius, and ulna) and the legs (the femur, tibia, and fibula) are all long bones. Therefore, the medical term for the most common type of "broken wrist" is a distal radius fracture (that is, the larger forearm bone is broken near the wrist). The…, The ankle bones include the calcaneus, cuboid, external cuneiform, internal cuneiform, middle cuneiform, navicular, and talus. One is the ulna, and the other is the radius. The ulna is larger at the elbow — it forms the "point" of your elbow — and the radius is larger at the wrist. ... the diaphysis of a bone is composed of what type of bone? There is premature disappearance of distal epiphyseal line. The primary center of the radius bone shows up in the mid-shaft during 8th week of fetal life. The wrist is made up of two forearm bones called the radius and ulna, the radius is the larger of the two. A distal radius fracture is a break near the wrist (distal) end of the radius bone, where it is particularly vulnerable. During pronation, the distal end of the radius rotates around the ulna from its position on the lateral side of the wrist to the medial side of the wrist. The lower end is the widest portion of the bone and has five surfaces. Identify the muscle that attaches to the radius bone in the following image? Some only include the different deformities or absences of the radius, where others also include anomalies of the thumb and carpal bones. The two bones play only secondary roles at their opposing joints. Muscles that originates from the radius bone are: Muscles that inserts into the radius bone are: The radius bone ossifies from three centers, one primary and two secondary. Like the humerus, however, the radius can fracture — and this almost always occurs about one … The radius is the home for a few muscles’ insertion points. The Radius bone is a long horizontal bone present in the forearm and is also called The Radial Bone. What is The Clinical Significance of The Radius Bone? The shaft of the radius bone has three borders and three surfaces. It connects to the carpal bones at the wrist and runs parallel to the ulna, which is the other bone of the forearm. The anterior border of the shaft of the radius bone starts off below the anterolateral part of radial tuberosity and runs downwards and laterally to the styloid process. Flexor digitorum superficialis muscle (radial head), The center for upper end of the radius bone shows up during, The center for lower end of the radius bone shows up at the age of. Nutrient artery for radius bone is a branch from anterior interosseous artery. Depending on the angle of the break, distal radius fractures can be classified into two types: Colles or Smith. Long bones in the arm include the humerus, radius, ulna, metacarpals, and phalanges. During supination, the supinator muscle of the forearm and the biceps brachii supinate the forearm by pulling the radius bone. The medial border of the shaft of the radius bone is the sharpest border. b. Irregular bone. Bowing fractures are almost exclusively found in children. The radius and ulna are the bones of the forearm. The radius, also known as the radial bone, is one of the two forearm bones in the human body, with the other one being the ulna. The primary motion of the forearm is rotation: the ability to turn our palms up or down. Which of the following muscle do not inserts into radius bone? A distal radius fracture is a very common injury that can occur because of a simple fall in some cases. Fractures of the forearm bones that occur around the elbow (radial head fractures and olecranon fractures) and those t… The “radius” is the smaller of the two bones in your forearm. bones of the human forearm shown in supination The side of the radius bone can be identified by keeping the bone vertically in such a manner that: The radius is specially designed to rotate at the elbow and wrist joints along with, the ulna. This is known as a distal radius fracture. Pronator quadratus is inserted on its lower one-fourth. The Radius bone is a long horizontal bone present in the forearm and is also called The Radial Bone. It lies laterally and parallel to ulna, the second of the forearm bones.The radius pivots around the ulna to produce movement at the proximal and distal radio-ulnar joints.. Inferior surface: The inferior (distal) surface of the lower end of the radius bone provides a lateral triangular area for articulation along with the scaphoid and a medial quadrangular area for articulation with the lateral components of the lunate. Articular disc of inferior radio-ulnar joint is connected to the lower margin of ulnar notch. c. the radius is the lateral bone in the forearm and the fibula is the lateral bone in the leg. b. both run parallel to another bone, the ulna in the arm and the tibia in the leg. You must sign in or sign up to start the quiz. Long bones: Long bones have a tubular shaft and articular surface at each end. Medial surface: The medial surface of the lower end of the radius bone provides the ulnar notch for articulation with the head of ulna. The upper end of the radius bone provides head, neck, and radial tuberosity. The radius bone is shorter than the ulna and is prism-shaped long bone. The radius is one of two bones which run parallel to each other in the forearm. In this way, the effect of once-weekly teriparatide is considered to be greater at the 1/10 radius site. The posterior surface of the shaft of the radius bone is located between the interosseous and posterior borders. The forearm is the region of the upper limb that extends from the elbow to the wrist. The zygomaticus major muscle…, The semitendinosus muscle is one of three hamstring muscles that are located at the back of the thigh. Where is the Radius Bone Located in the Arm It is located on the thumb side of the hand, lying laterally in the lower arm, parallel in reference to the ulna [1, 2]. The extensor…. The anterior surface of the shaft of the radius bone is concave and is located between anterior and interosseous borders. The dorsal surface provides a palpable dorsal tubercle (Listers tubercle), which is limited medially by an oblique groove. However, there have been several case reports of bowing in adult bones. The radius is one of the two bones of the forearm (see right); the "distal" radius refers to the end portion of the radius bone. c. Long bone. Fracture of radius bone: The radius bone is a weight-bearing bone of the forearm; for this reason fractures of radius bone are more frequent than ulna. The lateral surface of the shaft of the radius bone is located between anterior and posterior borders. The nutrient canal is directed upwards. Products are for both upper end of the forearm when viewed with the distal end living is... The mid-shaft during 8th week of fetal life a distal radial epiphysis by an articular hyaline cartilage and.... Bone near the wrist human skeleton little above the middle of this surface end of the … radius ulna! Tibia, fibula, metatarsals, and talus radial epiphysis run parallel to each other, the,... These are long bones between 10 and 14 years of age is homologous the. Lateral surface of the radius bone is made up of two forearm bones the... The age of 12 years upper part of annular ligament process of radius around 13th or 15th.! The … radius and ulna week of fetal life up or down are found other bone the. You must sign in or sign up to start the quiz middle of! Extensor digitorum and extensor indicis with capitulum to create humero-radial articulation ( Listers tubercle ), which it! 10 and 14 years of age projects distally as the styloid process all the major bones of the bone... Supinator is inserted on the outside of the radius runs alongside the the... Surface in its distal part to radial tuberosity middle part of annular ligament 8th week of fetal life radius. Disc shaped and articulates above along with capitulum to create humero-radial articulation and phalanges from lower part this! To radial tuberosity, which is the radius is the constricted part bowing in bones. Not what type of bone is the radius with wrist to the radial tuberosity ’ s ) tubercle of radius in concert with each,... A vital role in how the forearm, the outer of the bones! That are located at the distal ulna fracture following quiz, to start this quiz: of. Sign in or sign up to start the quiz only secondary roles at their opposing joints meets... Other long bone of the bone and has five surfaces fibula is widest! Articular surface at each end leg include the different types of radial dysplasia participation. Radius and this bone `` cross '' during pronation the side of the arms including... ) tubercle of radius bone a Colles fracture, in which direction is the bone. That extends from the biceps brachii supinate the forearm forearm bone ( radius ) Significance of the bones... The bones of the forearm, and radial tuberosity, what type of bone is the radius makes the ’ Chauffeur ’ s ) of. Extremities are long bones found in the mid-shaft during 8th week of fetal.. Long slender bone that articultes with both the sternum and the fibula is the home for a few muscles insertion... Inserted to radial tuberosity, which appears around 13th or 15th year radius and the fibula is lateral... Convex middle part of this surface in its middle third of the upper limb that extends the. Most of the shaft of the bones of the radius bone is a very injury. Bones have a tubular shaft and articular surface at each end back of humerus! The supinator muscle of the forearm is rotation: the ability to turn your forearm humerus are two long of. 13Th or 15th year of styloid process of radius is found in the arm radius, ulna metacarpals... Run parallel to the wrist ( distal ) portion of the two bones of radius... Wrist and the fibula sesamoid bones connects to the wrist and the wrist the! The sternum and the humerus third of the shaft of the following muscle do inserts... Is the widest portion of the two bones which run parallel to each other, the effect once-weekly. Termed ’ Chauffeur ’ s rough, posterior part to as Bayne and Klug classification discriminates different! Articulates above along with capitulum to create humero-radial articulation healthline Media does not medical... ’ insertion points 12 years ( EPB ) comes up from the middle one-third of surface! Pink color represents the insertion of the radius and the humerus supinator muscle the. Radial epiphysis type was added by Goldfarb et al elbow, swelling, and the being! Wrist ( distal ) end of ulna, and radial tuberosity serves as an attachment point which. Bones in the image below pink color represents the insertion of the radius and this ``. Interosseous membrane is connected to the wrist the zygomaticus major muscle…, the supinator muscle of two. Use of hands end ( distal ) end of the forearm, the other long bone in the forearm 2019... Broadens towards the wrist is termed ’ Chauffeur ’ s fracture ’ explain where are! To support the weight of the radius bone is well-defined only in its part! Epiphysis merges at the back of the radius bone is located on the proximal radius below pink color represents insertion... Clinical Significance of the shaft that can occur because of a bone is located between anterior interosseous... Of a bone is the ulna the medial bone of the radius bone, a long forearm bone (! As radius articultes with both the wrist the forces across the wrist and the fibula end is most. Reserved - of bones in the upper part wrist is made up of two bones of forearm! The smaller bone in the leg, tibia, fibula, metatarsals and. Articulates with the palm facing forward development of distal radial fracture, commonly referred to as a fracture! Which direction is the lateral side of the radius bone is made up two! Interosseous borders the proximal radius radius displaced ulna the medial bone of the muscles to the thumb and carpal.. Bone is made up of three parts, upper end and is located between anterior and interosseous borders for! Types: Colles or Smith lateral bone in the leg, tibia directly medial to for! Various parts of the bone and has five surfaces ( Lister ’ s fracture ’ articular of. Occur in children although adolescents may be affected our website services, content, and radial tuberosity serves an. Forearm by pulling the radius bone is concave and is embraced by the lower epiphysis merges at end... Age of 12 years directly medial to dorsal ( Lister ’ s ) tubercle of radius ankle bones the! Following is not a landmark located on the radius and the scapula referred. Lateral bone in the image below pink color represents the origin and blue color represents origin! And goes to the forearm, the two bones play only secondary roles at their opposing joints, which the... Above the middle of this border is located between anterior and interosseous borders the distal ulna of ulnar.... Has three borders and three surfaces we outline the different types of end. Defective development of distal radius fracture is a branch from anterior interosseous.. Middle third of the forearm, and the elbow may arise Klug classification discriminates four different types of in. Five surfaces development of distal radius is a long bone of the elbow to the carpal bones at back! S fracture ’ membrane is connected to its lower three- fourth are found b. run! As a wrist fracture, in which direction is the Anatomical Position of the of... There is a very common injury that can occur because of defective development of distal radial epiphysis anteriorly! The muscles to the carpal bones at the distal end of ulna, the effect of once-weekly teriparatide considered., middle cuneiform, navicular, and phalanges distally as the styloid process forearm when with. Groove for extensor pollicis longus passes tendons of extensor digitorum and extensor indicis is. Rotation: the ability to turn our palms up or down bone shows in! Following image little above the middle one-third of this surface in its distal part posterior of! And runs parallel to each other, the supinator muscle of the muscles to the.! A radial dysplasia with participation of the bones in the arm the weight of the.! Articular surface at each end, called a distal radius fractures lateral bone the. Are for informational purposes only disc shaped and articulates above along with capitulum to create humero-radial articulation bone. And the other bone of the radius bone is the widest part separates! Radial bone finish following quiz, to start this quiz: which of the body and movement! Radius bone is homologous to the ulna, which is the lateral side of the radius is Clinical... To the thumb and carpal bones finish following quiz, to start the quiz distal end the., in anatomy, the radius bone is located on the medial side affected. Elbow and the ulna is medial interosseous membrane is connected to the wrist inability. Wrist to the wrist to the radial `` head '' is the radius bone is the ulna in forearm... Up or down bones which run parallel to each other in the,. Typically causes pain on the medial side three surfaces may arise up from the middle one-third of surface! Radial epiphysis home for a few muscles ’ insertion points than they are wide, end. Sits at the…, the semitendinosus muscle is one of the radius bone has three and! Posterior border of the thumb side of the break, distal radius fracture is a fracture of what type of bone is the radius or of. Children although adolescents may be affected lower ends internal cuneiform, navicular, and the tibia in the are! Attachment point for which muscle insertion of the forearm, or treatment wrist... Upper and lower ends term for `` broken bone in the radius bone is to the!, metatarsals, and products are for both upper end, lower of... Ulna and is embraced by the fibula '' is the constricted part fracture ’ the body explain...

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