Number 1 is the position of the extensor retinaculum, 2 is the The first metacarpal bone (thumb) is the shortest and most mobile. The skin of the palmar surface of the hand is unique, with characteristics for special function.
A hand is a prehensile, multi-fingered appendage located at the end of the forearm or forelimb They also have the greatest positioning capability of the body; thus, the sense of touch is intimately associated with hands. . The median nerve supplies the palmar side of the thumb, index, middle, and half ring fingers. Dorsal.
Retrieved September 21, 2017.
In clinical practice, it is customary to select one of these septa attached to the third metacarpal for special consideration and to use it as the basis for a description of two fascial "spaces" of the palm.
The ligaments that maintain the distal carpal arches are the transverse carpal ligament and the intercarpal ligaments also oriented transversally.
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These movements occur at all the joints of the thumb, although opposition takes place mainly at the carpometacarpal joint. The flexor retinaculum is a strong, transverse, fibrous band that confines the flexor tendons of the five fingers, together with their synovial sheaths and the median nerve, to the arch of the carpus, which it converts into the carpal tunnel figs.