Opponens digiti minimi muscle
|Opponens digiti minimi muscle|
Deep muscles of the left hand, dorsal view.
|Latin||musculus opponens digiti minimi
(Old: Opponens quinti digiti)
|Origin||Hook of hamate and flexor retinaculum|
|Insertion||Medial border of 5th metacarpal|
|deep branch of ulnar nerve (C8 and T1)|
|Actions||Draws 5th metacarpal anteriorly and rotates it, bringing little finger (5th digit) into opposition with thumb|
|Anatomical terms of muscle|
The opponens digiti minimi (opponens digiti quinti in older texts) is a muscle in the hand. It is of a triangular form, and placed immediately beneath the palmaris brevis, abductor minimi digiti, and flexor brevis minimi digiti. It is one of the three hypothenar muscles that controls the little finger.
It arises from the convexity of the hamulus of the hamate bone, and contiguous portion of the transverse carpal ligament; it is inserted into the whole length of the metacarpal bone of the little finger, along its ulnar margin.
Opponens minimi digiti serves to flex and laterally rotate the 5th metacarpal about the 5th carpometacarpal joint, as when bringing little finger and thumb into opposition. It is innervated by the deep branch of the ulnar nerve.
The muscles of the thumb. (Opponens quinti digiti visible at center right.)
Front of the left forearm. Deep muscles. (Opponens digiti quinti visible at bottom left.)
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