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