Plantar interossei muscles
|Plantar interossei muscles|
The Interossei plantares. Left foot.
|Latin||Musculi interossei plantares|
|Artery||Plantar Artery, and Dorsal Metatarsal A|
|Nerve||Lateral plantar nerve|
|Antagonist||Dorsal interossei of the foot|
|Anatomical terms of muscle|
In human anatomy, the plantar interossei of the foot are three muscles located between the metatarsal bones.
The three plantar interosseous muscles are unipennate[clarification needed] 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 isn't of extreme importance to the toes, but the these muscles work together with the dorsal interosseous muscles in flexion of the foot. They also work together to strengthen the metatarsal arch.
This article uses anatomical terminology; for an overview, see anatomical terminology.
- Origin, insertion and nerve supply of the muscle at Loyola University Chicago Stritch School of Medicine
- 80740430 at GPnotebook
- Plantar+interossei at eMedicine Dictionary