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Intrinsic muscles have their origin in the part of the body that they act on, and are contained within that part. [17] Extrinsic muscles have their origin outside of the part of the body that they act on. [18] Examples are the intrinsic and extrinsic muscles of the tongue, and those of the hand.
The tendons of several extrinsic foot muscle reach the sole: The tendons of the deep foot flexors in the posterior compartment of the leg, tibialis posterior, flexor digitorum longus, and flexor hallucis longus, passes behind the medial malleolus into the sole. The tendon of fibularis longus similarly passes behind the lateral malleolus into ...
The human foot is a strong and complex mechanical structure containing 26 bones, 33 joints (20 of which are actively articulated), and more than a hundred muscles, tendons, and ligaments. [2] The joints of the foot are the ankle and subtalar joint and the interphalangeal joints of the foot.
The intrinsic muscles of the foot, muscles whose bellies are located in the foot proper, are either dorsal (top) or plantar (sole). On the dorsal side, two long extrinsic extensor muscles are superficial to the intrinsic muscles, and their tendons form the dorsal aponeurosis of the toes.
Extensor hallucis longus muscle. The mucous sheaths of the tendons around the ankle. Lateral aspect. (Ext. hall. long. labeled at upper left.) Extends (raises) the big toe and assists in dorsiflexion of the foot at the ankle. Also is a weak evertor/invertor. The extensor hallucis longus muscle is a thin skeletal muscle, situated between the ...
The three plantar interosseous muscles are unipennate, as opposed to the bipennate structure of dorsal interosseous muscles, and originate on a single metatarsal bone. The three muscles originate on the medial aspect of metatarsals III-V. The muscles cross the metatarsophalangeal joint of toes III-V so the insertions correspond with the origin ...
The abductor hallucis muscle is located in the medial border of the foot and contributes to form the prominence that is observed on the region. It is inserted behind on the tuberosity of the calcaneus, the flexor retinaculum, and the plantar aponeurosis. [1] Its muscle body, relatively thick behind, flattens as it goes forward.
Extensor digitorum longus muscle. The mucous sheaths of the tendons around the ankle. Lateral aspect. (Extensor dig. longus labeled at upper right.) Animation. Details. Origin. Anterior lateral condyle of tibia, anterior shaft of fibula and superior 3⁄4 of interosseous membrane. Insertion.