PEDS100 Chapter Notes -Extensor Hallucis Longus Muscle, Extensor Digitorum Longus Muscle, Peroneus Tertius

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Anything between the malleoli anteriorly dorsiflexes, anything between them posteriorly plantar flex. Anything going laterally everts, anything going medially invert. Anterior compartment: all muscles except tibialis anterior originate on fibula and interosseus membrane. O: lateral condyle and proximal shaft of tibia. I: base of first metatarsal bone and medial cuneiform. Extensor hallucis longus: palpable only on top of foot, not in shin area. I: superior surface, distal phalanx of great toe. A: extension at joints of great toe, dorsiflexes ankle. O: anterior surface of fibula, lateral condyle of tibia, Peroneus tertius dorsi: (tertius means 3) peroneus muscles are only evertors of foot. Tendon crosses deep in sole of foot to 1st metatarsal. Posterior superficial group plantar flex foot at ankle. Lateral is a bit higher up on femur. (big bulge in back of calf) O: head and proximal shaft of fibula, adjacent posteromedial shaft of tibia. A: plantar flexion at ankle, postural muscle when standing.

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