Foot Muscles:Origin, Insertion, Action & Nerve Supply
The muscles of the foot can be separated into two distinct groups; extrinsic and intrinsic muscles.
- The extrinsic muscles of the foot arise from the anterior, posterior and lateral compartments of the leg muscles. They are chiefly liable for actions such as inversion, eversion, plantarflexion, and dorsiflexion of the foot.
- The intrinsic muscles are positioned within the foot and are liable for the fine motor actions of the foot, for example, movement of individual digits.
They can be separated into the dorsum of the foot, and those in the sole of the foot.
Plantar Aspect of the Foot
The muscles of the plantar aspect are described in four layers (superficial to deep).
- Quadratus Plantae
- Flexor Hallucis Brevis
- Adductor Hallucis
- Flexor Digiti Minimi Brevis
- Plantar Interossei
- Dorsal Interossei