Abductor hallucis muscle
|Abductor hallucis muscle|
First layer of muscles of the sole of the foot (abductor hallucis visible at lower right)
|Origin||Medial process of calcaneal tuberosity, Plantar aponeurosis, Flexor retinaculum|
|Insertion||Medial aspect of base of 1st phalanx of hallux|
|Artery||Medial plantar artery|
|Nerve||Medial plantar nerve|
|Antagonist||Adductor hallucis muscle|
|Latin||Musculus abductor hallucis|
|Anatomical terms of muscle|
The abductor hallucis muscle is located in the medial border of the foot and contributes to form the prominence that is observed on the region. It is inserted behind on the tuberosity of the calcaneus, the flexor retinaculum, and the plantar aponeurosis. Its muscle body, relatively thick behind, flattens as it goes forward. It ends in a common tendon with the medial head of the flexor hallucis brevis that inserts on the medial surface of the base of the first proximal phalanx and its related sesamoid bone. Its medial surface is superficial and covered with the muscle's fascia and the skin.
Abductor hallucis is innervated by the medial plantar nerve. The nerves that supply it enter the muscle from its upper border. The deep tendon reflex of the abductor hallucis. was first described and demonstrated by Dr. M. W. Spanakos.