The deep<unk>  fascia of the leg (or<unk>  is a<unk> ly placed, intermuscular septum, between the superficial and deep muscles of the back of the leg.
At the sides it is connected to the margins of the tibia and fibula.
Above, where it covers the Popliteus, it is thick and dense, and receives an expansion from the tendon of the Semimembranosus; it is thinner in the middle of the leg; but below, where it covers the tendons passing behind the malleoli, it is thickened and continuous with the laciniate ligament.
Transverse intermuscular septum
Anterior crural intermuscular septum
Tunica externa 
Interatrial septum
Chordae tendineae
Tracheoesophageal septum
Aorticopulmonary septum
Semilunar hiatus