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First Lumbrical Muscle of Foot
Muscular System

First Lumbrical Muscle of Foot

Musculus lumbricalis pedis primus

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Quick Facts

Origin: Tendon of flexor digitorum longus that travels to the second toe.

Insertion: Medial aspect of extensor expansion of second toe.

Action: Simultaneously flexes metatarsophalangeal joint and extends interphalangeal joints of second toe.

Innervation: Medial plantar nerve (S2-S3).

Arterial Supply: Lateral plantar artery, deep plantar arch, and plantar metatarsal arteries.

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Origin

The first lumbrical muscle of foot originates from the medial aspect of the tendon of flexor digitorum longus that travels to the second toe.

Insertion

The fibers of the first lumbrical muscle of foot travel anteriorly to the second toe and insert, via a short tendon, onto the medial aspect of the extensor expansion of the second toe.

Key Features & Anatomical Relations

The first lumbrical muscle of foot is located in the second layer of muscles that are found in the plantar part of the foot. It is a short, wormlike, unipennate skeletal muscle.

It is located:

- superficial (inferior) to the adductor hallucis muscle;

- deep (superior) to the plantar aponeurosis;

- medial to the tendon of flexor digitorum longus that travels to the second toe;

- lateral to the flexor hallucis brevis muscle.

Actions

The first lumbrical muscle of foot simultaneously flexes the second metatarsophalangeal joint and extends the interphalangeal joints of the second toe (Moore, Dalley and Agur, 2009).

List of Clinical Correlates

- Clawing of the toes

- Charcot-Marie-Tooth disease

References

Moore, K. L., Dalley, A. F. and Agur, A. M. R. (2009) Clinically Oriented Anatomy. Lippincott Williams & Wilkins.

Actions

The first lumbrical muscle of foot simultaneously flexes the second metatarsophalangeal joint and extends the interphalangeal joints of the second toe (Moore, Dalley and Agur, 2009).

Learn more about this topic from other Elsevier products

Foot Muscle

ScienceDirect image

In fact, atrophy of foot muscles is even observed in patients without clinical signs of DSPN, underlining the presence of motor changes in DSPN well in advance of clinical findings and complaints [85].

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