Interosseous muscles of the foot

The interosseous muscles of the foot are muscles found near the metatarsal bones that help to control the toes. They are considered voluntary muscles.

Interosseous muscles of the foot
Details
Origin	Dorsal: Adjacent sides of 1st through 5th metatarsals. Plantar: Bases and medial sides of 3rd through 5th metatarsals.
Insertion	Dorsal: 1st = medial side of proximal phalanx of 2nd digit; 2nd through 4th = lateral sides of digits 2-4. Plantar: Medial sides of bases of proximal phalanges of 3rd through 5th digits.
Artery	Dorsal: Arcuate artery, dorsal and plantar metatarsal arteries. Plantar: Lateral plantar artery and plantar arch, plantar metatarsal and plantar digital arteries.
Nerve	Lateral plantar nerve
Actions	Dorsal: Abducts 2nd through 4th toes, flex metatarsophalangeal joints, and extend phalanges. Plantar: Adduct digits (2-4) and flex metatarsophalangeal joint and extend phalanges.
Anatomical terms of muscle [edit on Wikidata]

They are generally divided into two sets:

• 4 Dorsal interossei - Abduct the digits away from the 2nd digit (away from axial line) and are bipennate.
• 3 Plantar interossei - Adduct the digits towards the 2nd digit (towards the axial line) and are unipennate.

The axial line goes down the middle of the 2nd digit, towards the sole of the foot (it's an imaginary line).

Both sets of muscles are innervated by the Lateral plantar nerve.^[1]

References

1. Tank, Patrick W. (2009). Grant's Dissector (14th ed.). Philadelphia: Wolters Kluwer Health/Lippincott, Williams & Wilkins. ISBN 0781774314.