Orthopaedic Jobs

Muscles of the Leg


- See:
       - Innervation:
       - Plantar Muscles of the Foot:

- Fascial Compartments:
     - Anterior Compartment
     - Lateral Compartment
     - Deep Posterior Compartment
     - Superficial Posterior Compartment

- Anterior Compartment:
     - anterior to the interosseous membrane and lateral to tibia  are muscles that dorsiflex ankle & extend toes (Tibialis Anterior,EHL,
             EDL, peroneus tert.);
     - they arise from lateral side of tibia, interosseous membrane, & fibula;

- Posterior Compartment (Superficial)
     - this compartment is subdivided into superficial and deep groups by transverse intermuscular septum (deep crural);
     - superficial group consists of:
          - Gastrocnemius:
          - Soleus:
          - Plantaris:

- Deep Posterior Compartment: consists of:
    - FHL;
    - FDL;
    - Tibialis Posterior;
    - Popliteus;

- Lateral Compartment:
    - lateral to the fibula and separated from other compartments by anterior & posterior intermuscular septa;
    - contains two muscles: peroneus longus and, deep to it,  Peroneus Brevis, both arising chiefly from the fibula;
    - tendons of both muscles pass behind the lateral malleolus;
    - that of brevis inserts on base of fifth metatarsal, & that of longus crosses the plantar surface of foot to insert on medial cuneiform     
         & base of the first metatarsal on the medial side of the foot;
    - chief action of both muscles is eversion of the foot;

- Crural Fascia:
    - except where anterior and lateral surfaces of tibia is subQ, leg is surrounded by a tough, fibrous layer, crural fascia, which projects
           deeply as the several intermuscular septa separating the groups of muscles



Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Monday, December 5, 2011 4:40 pm