The adductor hallucis is one of the intrinsic muscles within the third layer of the plantar muscles of the foot.
The intrinsic muscles of the foot consist of one intrinsic muscle on the dorsal aspect of the foot (the extensor digitorum brevis), and 4 layers of muscles on the plantar aspect of the foot:
- 1st layer: abductor hallucis, flexor digitorum brevis, abductor digiti minimi
- 2nd layer: quadratus plantae, lumbricals
- 3rd layer: flexor hallucis brevis, adductor hallucis, flexor digiti minimi brevis
- 4th layer: dorsal interosseri, plantar interossei
Origin
- Transverse head: ligaments of the metatarsophalangeal joints of toes 2-5
- Oblique head: bases of metatarsals 2-4
Insertion
- Lateral side of base of proximal phalanx of great toe
Action
- Adducts great toe
- Assists in arch support
Innervation
- Lateral plantar nerve from tibial nerve: S2,S3
Blood Supply
- 1st plantar metatarsal artery