Adductor Hallucis
Foot · Lower Limb
The adductor hallucis is a two-headed muscle of the third plantar layer deep in the sole. Its oblique head arises from the bases of the second to fourth metatarsals, while its transverse head arises from the plantar metatarsophalangeal ligaments of the third to fifth toes. The two heads converge to insert on the lateral side of the base of the proximal phalanx of the great toe, along with the lateral sesamoid. It adducts the great toe, drawing it toward the second toe, and its transverse head in particular helps maintain the transverse arch of the foot. It is supplied by the deep branch of the lateral plantar nerve (S2-S3). The muscle is the direct antagonist of abductor hallucis on the opposite side of the great toe.
Origin, Insertion, Action & Nerve
Origin
Oblique head: bases of metatarsals 2–4; transverse head: plantar metatarsophalangeal ligaments of toes 3–5
Insertion
Lateral side of the base of the proximal phalanx of the great toe (with the lateral sesamoid)
Action
Adducts the great toe and helps maintain the transverse arch of the foot
Nerve
Deep branch of the lateral plantar nerve (S2–S3)
Attachments explained
The Adductor Hallucis is defined first by where it attaches. Its origin is the more fixed anchor, usually the proximal or more stable end that stays put during contraction, while its insertion is the more mobile point that is pulled toward the origin when the muscle shortens.
Origin
Oblique head: bases of metatarsals 2–4; transverse head: plantar metatarsophalangeal ligaments of toes 3–5
Insertion
Lateral side of the base of the proximal phalanx of the great toe (with the lateral sesamoid)
Action & function
When the Adductor Hallucis contracts, it produces the following movement: Adducts the great toe and helps maintain the transverse arch of the foot.
As part of the Foot group of the Lower Limb, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.
Nerve supply & clinical relevance
The Adductor Hallucis receives its nerve supply from the Deep branch of the lateral plantar nerve (S2–S3). This nerve carries fibres from spinal segment(s) S2, S3.
Because a muscle can only contract when its nerve is intact, injury to the Deep branch of the lateral plantar nerve or to its spinal roots (S2, S3) can weaken or paralyse the Adductor Hallucis, impairing the movements it normally produces (adducts the great toe and helps maintain the transverse arch of the foot). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Adductor Hallucis (the OIANS method)
Learn the adductor hallucis through its two differently oriented heads. The oblique head runs lengthwise from the metatarsal bases and drives adduction of the great toe, while the transverse head runs across the forefoot and cradles the transverse arch. Linking each head to a distinct job, adduction versus arch support, makes the muscle far easier to recall than a single fact.
Set it opposite the abductor hallucis: both attach to the base of the great toe's proximal phalanx, but the abductor pulls medially and the adductor pulls laterally, and their nerves differ, medial plantar for the abductor and the deep branch of the lateral plantar for the adductor. Holding that antagonistic pair together fixes both action and innervation at once.
Frequently asked questions
Where is the Adductor Hallucis located?
The Adductor Hallucis is a muscle of the Foot group, located in the Lower Limb.
What is the origin of the Adductor Hallucis?
Oblique head: bases of metatarsals 2–4; transverse head: plantar metatarsophalangeal ligaments of toes 3–5
What is the insertion of the Adductor Hallucis?
Lateral side of the base of the proximal phalanx of the great toe (with the lateral sesamoid)
What movements does the Adductor Hallucis produce?
Adducts the great toe and helps maintain the transverse arch of the foot
What nerve supplies the Adductor Hallucis?
Deep branch of the lateral plantar nerve (S2–S3)
Is the Adductor Hallucis free to study in OIANS?
The Adductor Hallucis is always free to browse. Its full origin, insertion, action and nerve details are open to everyone in the Muscle Directory. Quiz and Flashcard practice for the Lower Limb is part of the one-time Lifetime upgrade, though; only the Upper Limb decks are free to test yourself on.
Related muscles
Study the Adductor Hallucis
Test yourself on Lower Limb muscles with interactive quizzes and flashcards in the free OIANS app.
Quiz yourself → Flashcards Open the OIANS app
Browsing is always free. A one-time Lifetime unlock adds every region's quizzes, flashcards, progress tracking and explore tools.