Talk:Intercarpal articulations
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Wrist-joint proper
[edit]I removed this section from the article because the radiocarpal articulations is not intercarpal. I assume this is copy-pasted from Gray's 1918. --Joe de Coy (talk) 09:37, 11 August 2009 (UTC)
The wrist-joint proper is a true condyloid articulation, and therefore all movements but rotation are permitted.
Flexion and extension are the most free, and of these a greater amount of extension than of flexion is permitted, since the articulating surfaces extend farther on the dorsal than on the volar surfaces of the carpal bones.
In this movement the carpal bones rotate on a transverse axis drawn between the tips of the styloid processes of the radius and ulna.
A certain amount of adduction (or ulnar flexion) and abduction (or radial flexion) is also permitted.
The former is considerably greater in extent than the latter on account of the shortness of the styloid process of the ulna, abduction being soon limited by the contact of the styloid process of the radius with the greater multangular.
In this movement the carpus revolves upon an antero-posterior axis drawn through the center of the wrist.
Finally, circumduction is permitted by the combined and consecutive movements of adduction, extension, abduction, and flexion.
No rotation is possible, but the effect of rotation is obtained by the pronation and supination of the radius on the ulna.
The movement of flexion is performed by the Flexor carpi radialis, the Flexor carpi ulnaris, and the Palmaris longus; extension by the Extensores carpi radiales longus and brevis and the Extensor carpi ulnaris; adduction (ulnar flexion) by the Flexor carpi ulnaris and the Extensor carpi ulnaris; and abduction (radial flexion) by the Abductor pollicis longus, the Extensors of the thumb, and the Extensores carpi radiales longus and brevis and the Flexor carpi radialis.
When the fingers are extended, flexion of the wrist is performed by the Flexor carpi radialis and ulnaris and extension is aided by the Extensor digitorum communis.
When the fingers are flexed, flexion of the wrist is aided by the Flexores digitorum sublimis and profundus, and extension is performed by the Extensores carpi radiales and ulnaris.