Boundaries:
- 1. Superior Boundary: Circular line passing through the tuberositas tibiae.
- 2. Inferior Boundary: Circular line encircling the ankle, just distal to the malleoli.
Divisions:
- Anterior Compartment:
- Bounded by septum intermuscular cruris anterius (attached to anterior margin of the fibula).
- Lateral Compartment:
- Located between anterior and posterior septa, contains mm. peronei.
- Posterior Compartment:
- Bounded by septum intermuscular cruris posterius (attached to posterior margin of the fibula).
At the Level of the Malleoli:
- Narrow strip divided into:
- Regio talocruralis anterior.
- Regio talocruralis posterior.
The crural fascia divides the leg into three osteofascial regions: the anterior, posterior and lateral compartments of the leg.
- 1 Anterior compartment of leg (compartimentum cruris anterius)
- anterior group of muscles of leg
- 1.1 Anterior tibial vessels and deep fibular nerve
- anterior tibial artery and veins go through an opening in the interosseous membrane of the leg (middle tibiofibular ligament)
- deep fibular nerve emerges from the fibular canal through an opening in the anterior intermuscular septum of the leg
- 2 Posterior compartment of leg (compartimentum cruris posterius)
- posterior group of muscles of leg
- 2.1 Posterior tibial vessels and tibial nerve
- neurovascular bundle courses under the tendinous arch of the soleus and between the deep and superficial muscles of posterior group of the leg
- 2.2 Fibular vessels
- run in the musculofibular canal that lies between the shaft of the fibula and flexor hallucis longus
- 3 Lateral group of muscles of leg (compartimentum cruris laterale)
- lateral group of muscles of leg
- does not contain a neurovascular bundle
- 3.1 Superficial fibular nerve
- descends between the fibular muscles and pierces to the subcutaneous tissue in the distal part of the lateral compartment