Flexor Digiti Minimi Brevis (Hand)

Origin, Insertion, Action & Nerve

Attachments explained

The Flexor Digiti Minimi Brevis (Hand) is defined first by where it attaches. Its origin is the more fixed anchor, usually the proximal or more stable end that stays put during contraction, while its insertion is the more mobile point that is pulled toward the origin when the muscle shortens.

Action & function

When the Flexor Digiti Minimi Brevis (Hand) contracts, it produces the following movement: Flexes the little finger at the metacarpophalangeal joint.

As part of the Hand group of the Upper Limb, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.

Nerve supply & clinical relevance

The Flexor Digiti Minimi Brevis (Hand) receives its nerve supply from the Deep branch of the ulnar nerve (C8–T1). This nerve carries fibres from spinal segment(s) C8, T1.

Because a muscle can only contract when its nerve is intact, injury to the Deep branch of the ulnar nerve or to its spinal roots (C8, T1) can weaken or paralyse the Flexor Digiti Minimi Brevis (Hand), impairing the movements it normally produces (flexes the little finger at the metacarpophalangeal joint). This is why knowing the innervation is central to localising nerve lesions in clinical practice.

How to study the Flexor Digiti Minimi Brevis (Hand) (the OIANS method)

OIANS stands for Origin, Insertion, Action and Nerve, the four facts that uniquely define every skeletal muscle. To learn the Flexor Digiti Minimi Brevis (Hand), work through them in order: picture its origin, trace the muscle to its insertion, reason out the action that shortening between those two points must create, then add the nerve that drives it.

Most students remember the Flexor Digiti Minimi Brevis (Hand) fastest by linking its action back to its attachments rather than memorising each fact in isolation. Once the origin and insertion make sense, the action usually follows logically.

Flexor Digiti Minimi Brevis (Hand) quick facts

Region

Upper Limb

Group

Hand

Origin

Hook of the hamate and flexor retinaculum

Insertion

Base of the proximal phalanx of the little finger

Action

Flexes the little finger at the metacarpophalangeal joint

Nerve

Deep branch of the ulnar nerve (C8–T1)

Spinal roots

C8, T1

Frequently asked questions

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