Lower Leg

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					Lower Leg
    Muscles of the Anterior Leg
• Dorsiflexors of ankles and extensors of toes
  reside in anterolateral compartment as the tibia fills the
                        anteriomedial area
• Anterior tibialis:crosses to the medial arch of foot & is an
  invertor of foot, as well as dorsiflexor of ankle
• Extensor digitorum longus:primary function is to extend
  toes II-V (lift them up). It also performs dorsiflexion of the
  ankle and eversion of the foot.
• Extensor Hallucis longus [hallux = great toe]:extends the
  great toe (pulls it up), but also assists with dorsiflexion and
  inversion of the ankle.
• Peroneus tertius – small muscle, absent in some people.
  dorsiflexion and eversion of the ankle.
           Tibialis Anterior




            Extensor Digitorum
                 Longus


Peroneus
Tertius




           Extensor Hallucis
                Longus
     Muscles of the Lateral Leg
• Evertors of the foot
   – Tendons pass to the lateral margin and
     underside of the foot
      • Help to prevent excessive inversion
• Peroneus longus: ankle plantarflexion and
  eversion
• Peroneus brevus:does not go under the foot. It
  also performs plantar flexion and eversion of the
  ankle.
       Muscles of the Posterior leg
• Gastrocnemius: plantarflexor ankle & flexes knee
• Soleus: plantarflexor
• Plantaris:weakly plantarflexes the ankle joint &flex the knee
  joint. Its function is so minimal that its long tendon can readily
  be harvested for reconstruction elsewhere with little functional
  deficit
• Popliteus: relatively small muscle at the back of the tibia. Its
  tendon winds gradually upward around the lateral side of the
  knee to attach to the femur just above the outside of the knee
  on the lateral epicondyle.
• Flexor hallucis longus
• Flexor digitorum longus:Flexes distal phalanges of lateral four
  toes and foot at ankle. Supports lateral longitudinal arch
• Tibialis posterior: primary invertor & plantarflexor

				
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posted:11/6/2011
language:English
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