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The extensor tendons are connected to the second by a thin transverse band, known as the juncturae tendinum; they serve to maintain the central alignment of the extensor tendons over the metacarpal head, [5] thus increasing the available leverage. Injuries (such as by an external flexion force during active extension) may allow the tendon to ...
common extensor tendon 3rd metacarpal, base radial nerve, deep branch: Extensor digitorum extensor expansion of 2nd–5th middle, distal phalanges [7] posterior interosseus: posterior interosseus: extends fingers, wrist FDS, FDP: s125p451: Extensor digiti minimi extensor expansion, base of proximal phalanx, little finger extends little finger ...
Extensor digitorum tendons. Extensor indicis tendon. Extension of the medial four digits Fourth compartment syndrome: 5 Extensor digiti minimi tendon: Positioned directly over the distal radioulnar joint. Extensor digiti minimi usually has double tendon [2] in the fifth compartment upon inserting onto the little finger Vaughn-Jackson syndrome: 6
The primary function of the extensors is to straighten out the digits. The thumb has two extensors in the forearm; the tendons of these form the anatomical snuff box. Also, the index finger and the little finger have an extra extensor, used, for instance, for pointing. The extensors are situated within 6 separate compartments.
The common extensor tendon serves as the upper attachment (in part) for the superficial muscles that are located on the posterior aspect of the forearm: Extensor carpi radialis brevis; Extensor digitorum; Extensor digiti minimi; Extensor carpi ulnaris [1] [2]
Its tendon passes through a compartment of the extensor retinaculum, posterior to distal radio-ulnar joint, then divides into two as it crosses the dorsum of the hand, and finally joins the extensor digitorum tendon. All three tendons attach to the dorsal digital expansion of the fifth digit (little finger).
The tendons to the second, third, and fourth toes are each joined, opposite the metatarsophalangeal articulations, on the lateral side by a tendon of the extensor digitorum brevis. The tendons are inserted in the following manner: each receives a fibrous expansion from the interossei and lumbricals, and then spreads out into a broad aponeurosis ...
The capsule, extensor tendon, and skin are very thin and lax dorsally, allowing for both phalanx bones to flex more than 100° until the base of the middle phalanx makes contact with the condylar notch of the proximal phalanx. [1] At the level of the PIP joint the extensor mechanism splits into three bands.