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Lumbricals of foot

Other Terms: Lumbricals of foot, Musculus lumbricales pedis

Muscle parts

None

Latin name

Musculi lumbricales (pes)

Latin muscle parts

None

Group

Foot muscle – plantar group – second layer

Etymology

This muscle’s name in English is the worm muscle. The word lumbrical comes from the Latin lumbricus meaning “worm.”

Origin

First lumbrical arises from the big toe side of the flexor digitorum longus tendon, the other three lumbricals each arise from the adjacent sides of the flexor digitorum longus tendons.

Insertion

Pass anterior to the metatarsal phalangeal joint and wrap dorsally to join the extensor expansion of digits 2, 3, 4, and 5.

Action

Flexion of metatarso-phalangeal joints; extension of interphalangeal joints.

Nerve supply

Medial plantar nerve (S2 and S3) supplies the 1st lumbrical and the lateral plantar nerve (S2 and S3) supplies the other lumbricals

Blood supply

From proximal to distal the muscle is supplied by the lateral plantar artery, small branches from the plantar arch, and the four plantar metatarsal arteries.

Latin

Musculus lumbricales pedis

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