Radius (bone)
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| Bone: Radius (joint) | |
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| Upper extremity | |
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| Radius is #1 | |
| Gray's | subject #52 219 |
| MeSH | Radius |
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, prismatic in form 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.
It has a body and two extremities:
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[edit] 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.
[edit] See also
[edit] Additional images
 Radius l. dx. - ant. view |
 Radius l. dx. - post. view |
 Right human radius and ulna - post. view |
 Human arm bones diagram |
 Bones of left forearm - ant. view |
 Bones of left forearm - post. view |
 Left elbow-joint, showing anterior and ulnar collateral ligaments |
 The Supinator |
 Cross-section through middle of forearm |
 Transverse section across distal ends of radius and ulna |
[edit] External links
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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