Plantar Interossei (Foot) - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The plantar interossei are a group of intrinsic muscles within the foot. They form the deepest layer of plantar muscles and have a unipennate shape. Attachments: Originates from the medial side of metatarsals three to five. Attaches to the medial sides of the phalanges of digits three to five. Actions: Adduction of the lateral three digits and flexion at the metatarsophalangeal joints. Innervation: Lateral plantar nerve. Blood Supply: Lateral plantar artery By TeachMeSeries Ltd (2026) Fig 5The fourth layer of the plantar muscles. Note the unipennate shape of the plantar interossei, and the bipennate shape of the dorsal interossei 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 Frequent questions What are the plantar interossei muscles? The plantar interossei are intrinsic muscles located in the foot, forming the deepest layer of the plantar muscle group. They are characterised by a unipennate structure and play a crucial role in foot movement. Where do the plantar interossei muscles originate and insert? These muscles originate from the medial aspects of the third to fifth metatarsals and insert onto the medial sides of the phalanges of the same digits. This specific attachment allows them to effectively perform their functions. What actions do the plantar interossei perform? The primary actions of the plantar interossei include adducting the lateral three digits and facilitating flexion at the metatarsophalangeal joints. These movements are essential for balance and foot stability. Which nerve innervates the plantar interossei muscles? The lateral plantar nerve is responsible for innervating the plantar interossei muscles. This nerve supplies the necessary motor function for their actions. What is the blood supply for the plantar interossei? The blood supply to the plantar interossei muscles comes from the lateral plantar artery. This vascular supply is vital for maintaining their function and overall health of the muscle tissue. Rate This Article