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.
Related parts of the anatomy
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
The extrinsic foot muscles are those whose muscle bellies reside proximal to the foot, but tendons directly insert into the bones and ligaments.
