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Extensor retinaculum of the hand
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Extensor retinaculum of the hand : ウィキペディア英語版
Extensor retinaculum of the hand

The extensor retinaculum (dorsal carpal ligament, or posterior annular ligament) is an anatomical term for the thickened part of the antebrachial fascia that holds the tendons of the extensor muscles in place. It is located on the back of the forearm, just proximal to the hand. It is continuous with the palmar carpal ligament, which is located on the anterior side of the forearm.
It is a strong, fibrous band, extending obliquely downward and medialward across the back of the wrist, and consisting of part of the deep fascia of the back of the forearm, strengthened by the addition of some transverse fibers.
The extensor retinaculum is attached laterally to the lateral margin of the radius. However, it is not attached to the ulna, as the distance between these two bones varies with supination and pronation of the forearm. Instead the medial attachment is to the most medial of the carpal bones, the triquetrum (or triquetral bone) and pisiformis (or pisiform bone). The retinaculum is also attached in its passage across the wrist, to the ridges on the dorsal surface of the radius.
==Additional images==

File:Gray421.png|Transverse section across distal ends of radius and ulna.
File:Slide2val.JPG|Extensor retinaculum of the hand.Deep dissection.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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