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Encyclopedia > Radius (bone)
Bone: Radius (bone)
Upper extremity
Radius is #1
Gray's subject #52 219
MeSH Radius

The radius is the bone of the forearm that extends from the outside of your limb to your phlangx (lateral) 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. Image File history File links Illu_upper_extremity. ... Image File history File links Carpus. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Grays Anatomy illustration of a human femur. ... // The Human Forearm The forearm is the structure on the upper limb, between the elbow and the wrist. ... Elbow redirects here. ... // This digit is one of the five fingers (though the word finger can also refer exclusively to the non-thumb digits). ... In human anatomy, the wrist is the flexible and narrower connection between the forearm and the hand. ... The ulna (Elbow Bone) [Figs. ... In geometry, an n-sided prism is a polyhedron made of an n-sided polygonal base, a translated copy, and n faces joining corresponding sides. ...

Contents

Sections

Its upper end is small, and forms only a small part of the elbow-joint; but its lower end is large, and forms the chief part of the wrist-joint. Elbow redirects here. ... In human anatomy, the wrist is the flexible and narrower connection between the forearm and the hand. ...


It has a body and two extremities:

The body of the radius (or shaft of radius) is prismoid in form, narrower above than below, and slightly curved, so as to be convex lateralward. ... The upper extremity of the radius (or proximal extremity) presents a head, neck, and tuberosity. ... The lower extremity of the radius is large, of quadrilateral form, and provided with two articular surfaces - one below, for the carpus, and another at the medial side, for the ulna. ...

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. Cortical bone is one of two main types of bone. ...


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. A trabecula (plural trabeculae) is a small, often microscopic, tissue element in the form of a small beam, strut or rod, generally having a mechanical function, and usually but not necessarily composed of dense collagenous tissue. ...


The arrangement at the lower end is somewhat similar.


See also

Grays Anatomy illustration of a human femur. ... In zootomy, several terms are used to describe the location of organs and other structures in the body of bilateral animals. ... This article needs more context around or a better explanation of technical details to make it more accessible to general readers and technical readers outside the specialty, without removing technical details. ...

Additional images

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. The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body (or Grays Anatomy as it has more commonly become known) is an anatomy textbook widely regarded as a classic work on human anatomy. ...


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