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Extensor compartments of wrist (back of hand) The fingers have two long flexors, located on the underside of the forearm. They insert by tendons to the phalanges of the fingers. The deep flexor attaches to the distal phalanx, and the superficial flexor attaches to the middle phalanx. The flexors allow for the actual bending of the fingers.
Preventive therapy is recommended to preserve the function of the fingers. This may include physical exercise, stretching, proper bodily function and myofascial release (massage, foam roller). Exercises are focused on the forearm muscles, such as the extensor carpi ulnaris; extensor digitorum to antagonize the flexion of the fingers.
These tendons, along with those of flexor digitorum profundus, are enclosed by a common flexor sheath. The tendons attach to the anterior margins on the bases of the intermediate phalanges of the four fingers. These tendons have a split (Camper's Chiasm) at the end of them through which the tendons of flexor digitorum profundus pass.
The extensor digitorum muscle (also known as extensor digitorum communis) [2] is a muscle of the posterior forearm present in humans and other animals. It extends the medial four digits of the hand. Extensor digitorum is innervated by the posterior interosseous nerve, which is a branch of the radial nerve. [3]
Flexor digitorum profundus is a flexor of the wrist , metacarpophalangeal and interphalangeal joints. [2] The lumbricals, intrinsic muscles of the hand, attach to the tendon of flexor digitorum profundus. Thus, the flexor muscle is used to aid the lumbrical muscles in their role as extensors of the interphalangeal joints.
The extensor indicis proprius usually runs and inserts onto the ulnar side of the extensor digitorum communis of the index finger. [4] The fifth compartment is occupied by the extensor digiti minimi, the extensor of the little finger. The extensor carpi ulnaris passes through the sixth compartment to insert to the base of the fifth metacarpal bone.
The flexor and pronator muscles of the forearm include the pronator teres, flexor carpi radialis, palmaris longus, and flexor digitorum superficialis, all of which originate on the medial epicondyle and are innervated by the median nerve. [1] The flexor carpi ulnaris muscle also inserts on the medial epicondyle and is innervated by the ulnar ...
Extensor digitorum brevis manus is an extra or accessory muscle on the backside (dorsum) of the hand. It was first described by Albinus in 1758. [1] The muscles lies in the fourth extensor compartment of the wrist, and is relatively rare. [2] It has a prevalence of 4% in the general population according to a meta-analysis. [3]