Radius (bone)

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Bone: Radius (joint)
Upper extremity
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:

• Body of radius
• Upper extremity of radius
• Lower extremity of radius

Contents 1 Structure 2 See also 3 Additional images 4 External links

[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

• Bone terminology
• Terms for anatomical location
• Ossification of radius

[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

• Radial fractures

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 As such, some of the information contained herein may be outdated.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.

v • d • e Bones of upper limbs Pectoral girdle, clavicle conoid tubercle – trapezoid line – costal tuberosity – subclavian groove Scapula fossae (subscapular, supraspinatous, infraspinatous) – suprascapular notch – glenoid cavity tubercles (infraglenoid, supraglenoid) – spine of scapula – acromion – coracoid process borders (superior, lateral/axillary, medial/vertebral) – angles (superior, inferior, lateral) Humerus upper extremity: necks (anatomical, surgical) – tubercles (greater, lesser) – intertubercular sulcus body: radial sulcus – deltoid tuberosity lower extremity: capitulum – trochlea – epicondyles (lateral, medial) – supracondylar ridges (lateral, medial) – fossae (radial, coronoid, olecranon) Forearm radius: upper extremity (head, tuberosity) – body – lower extremity (ulnar notch, styloid process) ulna: upper extremity (tuberosity, olecranon, coronoid process, radial notch, trochlear notch) – body – lower extremity (head, styloid process) Hand carpus: scaphoid – lunate – triquetral – pisiform – trapezium – trapezoid – capitate – hamate (hamulus) metacarpus: 1st metacarpal – 2nd – 3rd – 4th – 5th phalanges of the hand: proximal – intermediate – distal