Origin and Insertion
The abductor digiti minimi arises from the pisiform bone, the pisohamate ligament, and the flexor retinaculum.
Its distal tendon ends in three slips that are inserted into the ulnopalmar margin of the proximal phalanx, the palmar plate of the metacarpophalangeal joint, and the sesamoid bone when present. Some fibers insert into the finger's dorsal aponeurosis, why the muscle acts similar to a dorsal interosseus in the middle finger.
Additionally, the ulnar-most portion of the tendon inserts into the little finger's digital cord, and the muscle thus forms part of a structure that flexes the metacarpophalangeal joint and extends the interphalangeal joints.
Read more about this topic: Abductor Digiti Minimi Muscle Of Hand
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