Transverse intermuscular septum of leg

Looks like

A sheet of fascia across the back of the leg between the superficial and deep calf muscles.

What it does

Divides the back of the leg into superficial and deep compartments, covering the deep flexors, vessels and tibial nerve.

Keeping it well

The deep compartment it closes off can develop compartment syndrome; it must be opened specifically in surgery.

Related conditions

• Achilles tendon rupture
• Chronic venous insufficiency
• Compartment syndrome
• Growing pains
• Lymphangitis
• Lymphatic filariasis (elephantiasis)
• Lymphoedema
• Restless legs syndrome
• Superficial thrombophlebitis
• Varicose veins
• Venomous snakebite