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An extensor expansion (extensor hood, [1] dorsal expansion, dorsal hood, dorsal aponeurosis [citation needed]) is the special connective attachments by which the extensor tendons insert into the phalanges. These flattened tendons (aponeurosis) of extensor muscles span the proximal and middle phalanges. [2]
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]
Extensor carpi radialis longus; Extensor carpi radialis brevis; Extensor carpi ulnaris; Extensor digitorum; of phalanges, at all joints Posterior compartment of the forearm. Extensor digitorum; Extensor digiti minimi (little finger only) Extensor indicis (index finger only) of phalanges, at interphalangeal joints [4] Lumbricals of the hand
Extensor carpi radialis brevis 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 ...
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 five muscles acting on the wrist directly — flexor carpi radialis, flexor carpi ulnaris, extensor carpi radialis, extensor carpi ulnaris, and palmaris longus — are accompanied by the tendons of the extrinsic hand muscles (i.e. the muscles acting on the fingers). Thus, every movement at the wrist is the work of a group of muscles ...
Dorsal: metacarpal bones 1 to 5. Palmar: metacarpal bones of digits 2, 4, 5: Insertion: Dorsal: bases of proximal phalanges and extensor expansions of digits 2 to 4. Palmar: base of proximal phalanx and extensor expansion of the same digit from which it originated. Nerve: deep branch of the ulnar nerve: Actions: Dorsal: Abduct digits. Palmar ...
The middle digit has two dorsal interossei insert onto it while the first digit (thumb) and the fifth digit (little finger) have none. Each finger is provided with two interossei (palmar or dorsal), with the exception of the little finger, in which the abductor digiti minimi muscle takes the place of one of the dorsal interossei.