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Fourth Lumbrical Muscle of Foot
Muscular System

Fourth Lumbrical Muscle of Foot

Musculus lumbricalis pedis quartus

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Quick Facts

Origin: Tendons of flexor digitorum longus that travel to the fourth and little toes.

Insertion: Medial aspect of extensor expansion of little toe.

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

Innervation: Deep branch of lateral plantar nerve (S2-S3).

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

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Origin

The fourth lumbrical muscle of foot consists of two heads:

- the medial head, which originates from the lateral aspect of the tendon of flexor digitorum longus that travels to the fourth toe;

- the lateral head, which originates from the medial aspect of the tendon of flexor digitorum longus that travels to the little toe.

Insertion

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

Key Features & Anatomical Relations

The fourth 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, bipennate skeletal muscle.

It is located:

- superficial (inferior) to the flexor digiti minimi muscle of foot and the third plantar interosseous muscle of foot;

- deep (superior) to the plantar aponeurosis;

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

- lateral to the tendon of flexor digitorum longus that travels to the fourth toe and the flexor digiti minimi muscle of foot.

Actions

The fourth lumbrical muscle of foot simultaneously flexes the fifth metatarsophalangeal joint and extends the interphalangeal joints of the little 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.

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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