The quadratus plantae is an intrinsic muscle of the foot. It is located within the second plantar muscle layer of the foot, and is a square-shaped muscle with two heads of origin.
- Attachments: Originates from the medial and lateral plantar surface of the calcaneus. It attaches to the tendons of flexor digitorum longus.
- Actions: Assists the flexor digitorum longus in flexion of the lateral four toes.
- Innervation: Lateral plantar nerve (branch of the tibial nerve)
- Blood Supply: Medial and lateral plantar arteries.