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CHP10TheMuscularSystem

Membrane inserts on distal origin phalanx i phalanx

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Unformatted text preview: iflexion= toes raised (causes ‘heel strike’ when stepping toes forward) forward) Plantar flexion= extension of foot…toes point down (‘toe-off’ extension as heel of other foot lifts off ground) as Inversion= soles turned medially Eversion= soles turned laterally Remaining muscles act on ankle & foot, grouped in 3 Remaining compartments: • Anterior (dorsiflexes ankle), lateral (fibular, plantar flex & evert foot), posterior (plantar flexes) (plantar • 8 leg muscles to learn, many more associated w/ region Muscles of leg (crural muscles) are bound by deep fasciae are deep that compress muscles & help force blood back towards heart (against gravity) heart Leg & Foot Muscles Leg Leg & Foot Muscles Leg Anterior group~ Extensor digitorum longus= extends toes, dorsiflexes & everts extends foot foot • Origin @ lateral condyle, fibula shaft, & interosseous Origin membrane; inserts on middle/distal phalanges II-V membrane; Extensor hallucis longus= extends big toe, dorsiflexes & extends inverts foot inverts • Origin @ medial aspect of fibula, i.membrane; inserts on distal Origin phalanx I phalanx Tibialis anterior= dorsiflexes & inverts foot • Origin @ lateral tibia, I.membrane; inserts on medial Origin cuneiform, MI cuneiform, Leg & Foot Muscles (cont.) Leg Posterior group~ Gastrocnemius= flexes knee, plantar flexes foot • Origin @ medial/lateral epicondyles; inserts on calcaneus Soleus= plantar flexes foot • Origin @ proximal 1/3...
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