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
Dorlands /Elsevier	m_22/12549417
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.

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.

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.

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.

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.

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.

Bones of the right foot. Plantar surface.

Muscles of the sole of the foot.

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