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LIF101 Anatomy

LIF101 Anatomy. Lecture 13: Muscles of the Lower Leg. Muscles of the Lower Leg. Divided by fascia into three compartments: Anterior compartment Posterior compartment Lateral compartment. Review of Foot Movements. Dorsiflexion (toes pointing up) Plantarflexion (toes pointing down)

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LIF101 Anatomy

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  1. LIF101Anatomy Lecture 13: Muscles of the Lower Leg

  2. Muscles of the Lower Leg • Divided by fascia into three compartments: • Anterior compartment • Posterior compartment • Lateral compartment

  3. Review of Foot Movements • Dorsiflexion (toes pointing up) • Plantarflexion (toes pointing down) • Inversion (sole of foot facing medially) • Eversion (sole of foot facing laterally)

  4. Muscles of the Anterior Compartment • Extensor digitorum longus • Extends toes 2 – 5 • Extensor hallicus longus • Extends big toe • Tibialis anterior • Dorsiflexes foot; inverts foot • Is apparent on surface when foot is dorsiflexed

  5. Other Structures of the Anterior Compartment • Tendons of • extensor digitorum longus • extensor hallicus longus • tibialis anterior • Retinacula

  6. Muscles of the Posterior Compartment • Gastrocnemius (lateral and medial heads) • Soleus (runs beneath gastrocnemius) • Both of these plantarflex and invert the foot. • Other structures: • Calcaneal (achilles’) tendon • Retinaculum

  7. Muscles of the Lateral Compartment • Fibularis (a.k.a. peroneus) longus • Fibularis (a.k.a. peroneus) brevis • Both of these evert and plantarflex the foot. • Other structures: • Distal tendons of peroneus muscles (wrap behind lateral malleolus

  8. Other Observations • Vastus medialis extends more distally than vastus lateralus • Calf is higher on outside; lower and rounder inside • Medial malleolus is higher than lateral malleolus

  9. Other Observations • Thigh muscles are more prominent anteriorly • Lower leg muscles are more prominent posteriorly

  10. Anatomical Landmarks(Lower Leg) • Tibialis anterior (just lateral to anterior crest of tibia) • Tendon of tibialis anterior • Tendon of extensor digitorum longus • Tendons of extensor hallicus longus (sometimes) • Calcaneal tendon • Fibularis longus and brevis tendons

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