Radius (bone)
The radius is the bone of the forearm that extends from the lateral side of the elbow to the thumb side of the wrist. The radius is situated on the lateral side of the ulna, which exceeds it in length and size. It is a long bone, prism-shaped and slightly curved longitudinally. The radius articulates with the capitulum of the humerus.
The word "radius" is Latin for "ray." In the context of the radius bone, a ray can be thought of rotating around an axis line extending diagonally from centre of capitulum to the centre of distal ulna.
The radius has a body and two extremities:
 Body of radius
Upper extremity of radius
Lower extremity of radius
Structure
The long narrow medullary cavity is enclosed in a strong wall of compact bone which is thickest along the interosseous border and thinnest at the extremities except over the cup-shaped articular surface (fovea) of the head where it is thickened.
The trabeculae of the spongy tissue are somewhat arched at the upper end and pass upward from the compact layer of the shaft to the fovea capituli; they are crossed by others parallel to the surface of the fovea.
The arrangement at the lower end is somewhat similar.
See also
Bone terminology
Terms for anatomical location
Ossification of radius
Additional images
Image:Radius ant.jpg|Radius l. dx. - ant. view
Image:Radius post.jpg|Radius l. dx. - post. view
Image:RightHumanPosteriorRadiusUlna.jpg|Right human radius and ulna - post. view
Image:Human arm bones diagram.svg|Human arm bones diagram
Image:Gray213.png|Bones of left forearm - ant. view
Image:Gray214.png|Bones of left forearm - post. view
Image:Gray329.png|Left elbow-joint, showing anterior and ulnar collateral ligaments
Image:Gray420.png|The Supinator
Image:Gray417_color.PNG|Cross-section through middle of forearm
Image:Gray421.png|Transverse section across distal ends of radius and ulna
External links
Radial fractures
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