Flexor digiti minimi brevis muscle of hand
Flexor digiti minimi brevis is a short intrinsic muscle of the hand. It belongs to the group called hypothenar muscles, along with abductor digiti minimi and opponens digiti minimi muscles. Hypothenar muscles are located on the ulnar (medial) aspect of the hand where they form an elevation above the base of the little finger named the hypothenar eminence.
Flexor digiti minimi brevis spreads from the hook of hamate bone and flexor retinaculum to the base of proximal phalanx of the little finger. The main function of this muscle is flexion of the little finger in metacarpophalangeal joint.
|Hook of hamate, flexor retinaculum
|Base of proximal phalanx of digit 5
|Metacarpophalangeal joint 5: Finger flexion (+ finger lateral rotation/opposition)
|Deep branch of ulnar nerve (C8, T1)
|Deep palmar branch of ulnar artery
In this article, we will discuss the anatomy and function of the flexor digiti minimi brevis muscle.
Origin and insertion
Flexor digiti minimi brevis muscle arises by a short tendon from the hook of hamate bone and medial aspect of flexor retinaculum. From here the muscle fibers run distally and medially, passing over the fifth metacarpophalangeal joint. The muscle inserts together with abductor digiti minimi onto the medial side of the base of proximal phalanx of the little finger.
Flexor digiti minimi brevis muscle is located on the ulnar side of the palm, creating the hypothenar eminence with abductor digiti minimi and opponens digiti minimi muscles.
The muscle is situated inferior and lateral to adductor digiti minimi muscle and superior and medial to opponens digiti minimi muscle. The proximal parts of flexor digiti minimi brevis and abductor digiti minimi muscles form a gap through which deep branches of the ulnar artery and ulnar nerve pass.
The flexor digiti minimi brevis, like other hypothenar muscles, is innervated by the deep branch of the ulnar nerve (root value C8 and T1).
Flexor digiti minimi brevis muscle receives its blood supply from the deep palmar branch of ulnar artery.
The main function of the flexor digiti minimi brevis is flexion of the little finger at the metacarpophalangeal joint. Also, this muscle participates in lateral rotation and opposition of the little finger.
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