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First plantar interosseous of foot: anatomy, location and function

A small muscle between the metatarsals on the sole of the foot. Adducts the 3rd toe toward the 2nd toe and flexes the metatarsophalangeal joint.

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Highlighted in the model: First plantar interosseous of foot. Click any part to read about it, or switch off “Highlight topic” to see the whole body. 3D data: BodyParts3D, © The Database Center for Life Science, CC BY 4.0; meshes simplified and recoloured. The model is an adult male.

First plantar interosseous of foot at a glance

What it is
A small muscle between the metatarsals on the sole of the foot.
Location
Origin: medial side of the base of the 3rd metatarsal. Insertion: medial side of the base of the proximal phalanx of the 3rd toe.
Function
Adducts the 3rd toe toward the 2nd toe and flexes the metatarsophalangeal joint.
Body system
Muscular · paired (left and right)
FMA ID
FMA37745 (Foundational Model of Anatomy)

Key facts

  • Innervation: lateral plantar nerve
  • The three plantar interossei lie in the fourth (deepest) layer of the sole and are unipennate.
  • Plantar interossei adduct toward the second toe (PAD); dorsal interossei abduct (DAB).

Structures next to the first plantar interosseous of foot

The nearest named structures in the 3D model, measured from the centre of each part:

References

  1. Foundational Model of Anatomy: First plantar interosseous of foot (FMA37745). EMBL-EBI Ontology Lookup Service.
  2. OpenStax. Anatomy and Physiology 2e, §11.2 Naming Skeletal Muscles. Rice University, 2022.
  3. Mitsuhashi N. et al. (2009). BodyParts3D: 3D structure database for anatomical concepts. Nucleic Acids Research 37, D782–D785. Data © The Database Center for Life Science, CC BY 4.0.

Related anatomy

Explore the whole body in the interactive 3D human anatomy model, or browse the A–Z list of human structures.