Plantar interossei muscles

Plantar interossei muscles

The Interossei plantares. Left foot.
Details
Origin Metatarsals
Insertion Proximal phalanges
Artery Plantar Artery, and Dorsal Metatarsal A
Nerve Lateral plantar nerve
Actions adduct toes
Antagonist Dorsal interossei of the foot
Identifiers
Latin Musculi interossei plantares
TA A04.7.02.071
FMA 37458

Anatomical terms of muscle

In human anatomy, plantar interossei muscles are three muscles located between the metatarsal bones in the foot.

Structure

The three plantar interosseous muscles are unipennate and originate on a single metatarsal bone. The three muscles originate on the medial aspect of metatarsals III-V. The muscles cross the metatarsophalangeal joint of toes III-V so the insertions correspond with the origin and there is no crossing between toes.[1]

The muscles then continue distally along the foot and insert in the proximal phalanges III-V. The muscles cross the metatarsophalangeal joint of toes III-V so the insertions correspond with the origin and there is no crossing between toes.[1]

Innervation

All of three interosseous muscles are innervated by the lateral plantar nerve. The lateral plantar nerve is a branch from the tibial nerve, which originally branches off of the sciatic nerve from the sacral plexus.[1]

Function

Since the intersseous muscles cross on the metatarsophalangeal joint, then they act on that specific joint and cause adduction of toes III, IV, and V.[1]

Adduction itself is not of extreme importance to the toes, but these muscles work together with the dorsal interosseous muscles in flexion of the foot. They also work together to strengthen the metatarsal arch.[2]

Additional images

See also

This article uses anatomical terminology; for an overview, see Anatomical terminology.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

  1. 1 2 3 4 Saladin, Kenneth (2012). Anatomy & Physiology: The Unity of Form and Function. New York, NY: McGraw-Hill. pp. 372–372, 498–499. ISBN 978-0-07-131638-5.
  2. ↑ O'Rahilly, Ronan. "Basic Human Anatomy". Dartmouth. Retrieved 12 December 2013.
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