Dorsal Interossei (Foot) - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The dorsal interossei are a group of intrinsic muscles within the foot. They form the deepest layer of plantar muscles and have a bipennate shape. Attachments: Originates from the lateral aspect of the metatarsals. The first muscle attaches to the medial side of the proximal phalanx of the second digit. The second to fourth interossei attach to the lateral sides of the proximal phalanxes of digits two to four. Actions: Abduction of the lateral four digits and flexion at the metatarsophalangeal joints. Innervation: Lateral plantar nerve. Blood Supply: Dorsalis pedis, dorsal metatarsal, lateral plantar and plantar metatarsal arteries. 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 dorsal interossei muscles in the foot? The dorsal interossei are intrinsic muscles located in the foot, forming the deepest layer of the plantar muscles. They have a bipennate structure and play a crucial role in foot movement. What is the origin of the dorsal interossei muscles? The dorsal interossei originate from the lateral sides of the metatarsals. Their specific attachments vary, with the first muscle connecting to the medial side of the second digit's proximal phalanx. What actions do the dorsal interossei perform? The dorsal interossei are responsible for the abduction of the lateral four toes and flexion at the metatarsophalangeal joints. These actions are essential for proper foot function and balance. Which nerve innervates the dorsal interossei muscles? The dorsal interossei are innervated by the lateral plantar nerve. This nerve is crucial for the motor control of these intrinsic muscles in the foot. What is the blood supply to the dorsal interossei? The dorsal interossei receive their blood supply from the dorsalis pedis artery, as well as the dorsal metatarsal, lateral plantar, and plantar metatarsal arteries. This vascularisation supports their function and health. Rate This Article