From anatomical position medial to lateral is the abductor digiti minimi, flexor digiti minimi brevis, and opponens digiti minimi.
3.
The flexor digiti minimi brevis is sometimes not present; in these cases, the abductor digiti minimi is usually larger than normal.
4.
They also provide motor innervation to quadratus plantae, abductor digiti minimi, flexor digiti minimi brevis, lateral three lumbricals, adductor hallucis, and the dorsal and plantar interossei.
5.
At the same time, the interossei ( and abductor digiti minimi ) lie relatively far from the anterior-posterior axis of the MP joints and are consequently effective abductors and adductors during MP extension.
6.
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.
7.
It is inserted into the medial side of the base of the first phalanx of digit V . It is separated from the abductor digiti minimi, at its origin, by the deep branches of the ulnar artery and the ulnar nerve.
8.
These three muscles form the fleshy mass at the base of the little finger, and are solely concerned with the movement of digit V . The other two muscles that make up the hypothenar muscle group are the abductor digiti minimi and the oppenens digiti minimi.
9.
In a 2007 study, the American artist and anatomist David J . Jackowe and his colleagues demonstrated that the mysterious white cord that courses along the ulnar aspect of the cadaver's carpus and little finger, long thought to be either an ulnar nerve variant or artistic error, is most likely the tendon of an anomalous forearm muscle, the accessory abductor digiti minimi.
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