Dorsal aponeurosis

The dorsal aponeurosis of the fingers is a fascia , in particular an aponeurosis , which attaches on the dorsal side of the hand to the distal phalanx of the finger, runs over the middle pod and at the level of the base phalanx on the palm side ( volar ) forms an attachment for the interossei and lumbrical muscles . Since the origin lies on the palm side ( palmar ) of the joint axis of the metacarpophalangeal joints, a contraction of these muscles leads to a flexion in the metacarpophalangeal joint . Due to the further course in the direction of the fingertip on the back of the finger, when the dorsal aponeurosis is tensed, the middle and end joints of the fingers are stretched .

In order to enable stretching in the metacarpophalangeal joint, the extensor digitorum muscle ( extensor digitorum muscle ), which comes from the forearm , is attached to the joint axis on the back of the hand.

A dorsal aponeurosis with basically the same structure is also found on the dorsum of the foot.

literature

• Walther Graumann and Rolf Baur: Compact textbook anatomy . Volume 2, Schattauer Verlag 2003. ISBN 9783794519446