CHAPTER 10. : The Leg And Dorsum Of The Foot

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MUSCLE COMPARTMENTS IN THE LEG


1. Anterior / extensor compartment

Boundaries

Laterally: extensor surface of the fibula and anterior intermuscular septum.

Medially: extensor surface of the tibia

Anteriorly: fascia cruris

Posteriorly: interosseous membrane

Task: Name the structures labelled A-D


Contents

 
  • Ankle extensor/ dorsiflexor muscles (review their attachments)
  • Deep peroneal nerve
  • Anterior tibial arteries

note : This the tightest of the compartments, therefore more vulnerable to compartment syndrome

 

2. Lateral compartment  

Boundaries

 

Anteriorly: anterior intermuscular septum

Posteriorly: posterior intermuscular septum

Medially: peroneal surface of the fibula

Laterally: fascia cruris


Contents

 

•  Peroneus longus and brevis(review their attachment)

•  Superficial peroneal nerve

( note the peroneus longus [P.L] , peroneus brevis [P.B] and Superficial Peroneal nerve [S.P.n] )

*No artery. Blood supply by branches of peroneal artery in the posterior compartment.

 


3. The posterior compartment

Boundaries

 

•  Anteriorly: tibia, fibula and the interosseous membrane

•  Anteromedially: fascia cruris

•  Postero-laterally: lateral intermuscular septum

 


Contents

 

Superficial triceps surae soleus and two heads of gastrocnemius' plus plantaris when present (review their attachments)

 


Deep;

  • Flexor muscles (review their attachments)
  • Posterior tibial artery
  • Tibial nerve