Second Lumbrical of Foot (Left) (Musculus lumbricalis pedis secundus)

Anatomy

The bipennate second of the four vermiform muscles, arising from the adjacent sides of the first and second tendons of flexor digitorum longus and running to the third toe. Like its fellows it works through the extensor hood rather than on a bone.

Origin & insertion

From the adjacent sides of the first and second tendons of flexor digitorum longus, into the lateral aspect of the extensor hood and metatarsophalangeal capsule of the third toe.

Action

Flexes the metatarsophalangeal joint of the third toe and extends its interphalangeal joints.

Innervation

Lateral plantar nerve (S2–S3).

Clinical notes

The 2nd–4th lumbricals are supplied by the lateral plantar nerve, so they fail together with the interossei in intrinsic-muscle atrophy — the electrophysiological footprint of a tarsal-tunnel or deep-branch lesion.

Related structures

• Flexor digitorum longus (left)
• Third metatarsal (left)
• proximal phalanx of the third toe (left)

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