PHTY100 Lecture Notes - Lecture 7: Extensor Hallucis Longus Muscle, Flexor Digitorum Brevis Muscle, Flexor Digitorum Longus Muscle
Document Summary
Muscles of leg: behind malleoli: plantar flexion. In front of malleoli: dorsiflexion: lateral to ap axis of foot: eversion, medial to ap axis of foot: inversion. Posterior deep: tibialis posterior, flexor hallucis longus, flexor digitorum longus. Anterior: tibialis anterior, extensor hallucis longus, extensor digitorum longus, peroneus tertius. Layer 1: one flexor and two abductors. Layer 2: long flexor tendons and two associated muscles: Layer 3: one adductor and two flexors: Interosseus membrane: connects margins of tibia and fibula, absorbs shock, attachment site for crural muscles. Retinacula: prevents bowstringing of tendons, binds tendons down. Synovial sheath: double layer of synovial membrane surrounding each tendon as it passes under retinacula, facilitates sliding of tendons. Plantar aponeurosis: most superficial structure of plantar surface of foot, triangular in shape, binds skin of the foot, provides attachment site for muscles, helps maintain arches of foot. Functions of foot: weight transmission, balance, assist in ambulation (moving from one place to another)
