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Encyclopedia > Lower extremity of radius
Bone: Lower extremity of radius
The radius and ulna of the left forearm, posterior surface. The top is proximal (elbow) and bottom is distal (wrist).
Gray's subject #52 220

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. Image File history File links Download high resolution version (717x1254, 103 KB) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... The ulna (Elbow Bone) [Figs. ... The radius and ulna of the left forearm, posterior surface. ... In Greek mythology, Carpus fruit was a son of Chloris and Boreas. ... The ulna (Elbow Bone) [Figs. ...

  • The carpal articular surface is triangular, concave, smooth, and divided by a slight antero-posterior ridge into two parts. Of these, the lateral, triangular, articulates with the scaphoid bone; the medial, quadrilateral, with the lunate bone.
  • The articular surface for the ulna is called the ulnar notch (sigmoid cavity) of the radius; it is narrow, concave, smooth, and articulates with the head of the ulna.

These two articular surfaces are separated by a prominent ridge, to which the base of the triangular articular disk is attached; this disk separates the wrist-joint from the distal radioulnar articulation. The scaphoid bone of the wrist is found on the thumb side of the hand, within the anatomical snuffbox. ... The lunate bone (os lunatum; semilunar bone) is a bone in the human hand that may be distinguished by its deep concavity and crescentic outline. ...

This end of the bone has three non-articular surfaces - volar, dorsal, and lateral.

  • The lateral surface is prolonged obliquely downward into a strong, conical projection, the styloid process, which gives attachment by its base to the tendon of the brachioradialis, and by its apex to the radial collateral ligament of the wrist-joint. The lateral surface of this process is marked by a flat groove, for the tendons of the abductor pollicis longus muscle and extensor pollicis brevis muscle.

The volar radiocarpal ligament (anterior ligament, palmar radiocarpal ligament)) is a broad membranous band, attached above to the anterior margin of the lower end of the radius, to its styloid process, and to the front of the lower end of the ulna; its fibers pass downward and medialward to be... The dorsal radiocarpal ligament (posterior ligament) less thick and strong than the volar, is attached, above, to the posterior border of the lower end of the radius; its fibers are directed obliquely downward and medialward, and are fixed, below, to the dorsal surfaces of the navicular, lunate, and triangular, being... Extensor carpi radialis longus is one of the five main muscles that control movement at the wrist. ... The extensor carpi radialis brevis is specific human muscle. ... The Extensor pollicis longus muscle is a muscle of the human body. ... The Extensor indicis proprius (Extensor indicis) is a narrow, elongated muscle, placed medial to, and parallel with, the extensor pollicis longus. ... The Extensor digitorum communis arises from the lateral epicondyle of the humerus, by the common tendon; from the intermuscular septa between it and the adjacent muscles, and from the antibrachial fascia. ... Radial collateral ligament can refer to: Radial collateral ligament (elbow) Radial collateral ligament (thumb) Category: ... In human anatomy, the wrist is the flexible and narrower connection between the forearm and the hand. ... The Abductor pollicis longus muscle is a muscle of the human body. ... The Extensor pollicis brevis muscle is a muscle of the human body. ...

Additional images

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, commonly known as Grays Anatomy after Henry Gray, is an anatomy textbook widely regarded as a classic work on human anatomy. ...



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