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. By TeachMeSeries Ltd (2025) Fig 1The second layer of the plantar muscles. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Rate This Article