Great Saphenous Vein
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Direct answer
Longest vein in the body, the great (long) saphenous vein begins at the medial end of the dorsal venous arch of the foot, passes a hand's breadth in front of the medial malleolus (the constant site for emergency venous cut-down), climbs along the medial border of the tibia, swings behind the medial femoral condyle, and ascends the medial thigh to pierce the cribriform fascia of the saphenous opening — 3 to 4 centimetres below and lateral to the pubic tubercle — and join the femoral vein. It carries ten to twenty valves (concentrated below the knee), runs for much of its course within a fascial envelope, and is accompanied by the saphenous nerve in the leg. Its incompetence at the saphenofemoral junction and at the ankle perforators generates varicose veins and medial gaiter ulcers, and its length and superficial course make it the emergency access vein and the coronary artery bypass graft.
What you must remember
- Course checkpoints: medial end of the dorsal venous arch; anterior to the medial malleolus; medial tibial border (crossing with the saphenous nerve); behind the medial condyle of the femur; medial thigh to the saphenous opening and the femoral vein.
- Saphenous opening anatomy: an oval gap in the fascia lata 3–4 cm below and lateral to the pubic tubercle, roofed by cribriform fascia; the vein passes through it, and the falciform margin (sharp inferior edge) protects its lower border.
- Tributaries at the saphenofemoral junction: superficial epigastric, superficial circumflex iliac and superficial external pudendal veins, plus the accessory saphenous — the connections ligated individually in a flush saphenofemoral ligation.
- Valves and perforators: 10–20 valves, more numerous below the knee; the ankle perforators (Cockett's) connect it to the posterior tibial veins — their incompetence causes the medial gaiter venous ulcer.
- Nerve companion: the saphenous nerve runs with the vein in the lower leg (anterior to it at the ankle); stripping or cut-down injures it, leaving numbness along the medial leg and foot border.
- Embryology of access: the great saphenous cut-down anterior to the medial malleolus is the classical emergency access in shocked patients and children when cannulation fails.
- Two great uses in surgery: the reversed or in situ graft for coronary and peripheral bypass, and flush ligation with stripping for varicose disease — stripped only to the knee to protect the nerve.
Working through a varicose leg
A teacher who stands all day presents with dilated medial leg veins, ankle swelling and skin changes above the medial malleolus. With the patient lying, the leg is elevated and the vein emptied; a tourniquet is placed below the saphenofemoral junction and the patient stands — if the veins below stay collapsed, the junction is the incompetent point (Trendelenburg with tourniquet); segmental refill implicates the perforators. Duplex ultrasound now maps the incompetence before surgery, because operating on the wrong point guarantees recurrence. A flush ligation divides every tributary to prevent recurrence; stripping stops at the knee to spare the nerve; phlebectomies finish the surface disease. The brown pigmentation, lipodermatosclerosis and finally the gaiter ulcer record years of ambulatory venous hypertension from the same failed valves.
Where students slip
Two confusions recur. First, great versus small saphenous: the great saphenous runs medially from the dorsal venous arch to the femoral vein; the small saphenous runs behind the lateral malleolus up the calf's midline to the popliteal vein — mixing their termination sites loses easy marks. Second, the cut-down landmark is "anterior to the medial malleolus"; adding that the saphenous nerve lies beside the vein here shows the applied understanding examiners reward. A third slip is forgetting that below the fascial envelope the vein's tributaries vary — the "anterior accessory" of the thigh is the commonest cause of recurrence when missed.
Frequently asked questions
Trace the course of the great saphenous vein from foot to termination.
From the medial end of the dorsal venous arch, anterior to the medial malleolus, along the medial tibial border, behind the medial femoral condyle, up the medial thigh to the saphenous opening, ending in the femoral vein.
What is the standard site for a great saphenous venous cut-down and which nerve is at risk?
Just anterior and proximal to the medial malleolus; the saphenous nerve accompanies the vein here and is at risk of injury causing medial foot numbness.
Which veins join the great saphenous vein at the saphenofemoral junction?
The superficial epigastric, superficial circumflex iliac and superficial external pudendal veins, plus the accessory saphenous — all ligated flush during varicose vein surgery.
Which perforators are blamed for medial ankle venous ulcers?
The Cockett perforators connecting the great saphenous system to the posterior tibial veins; their incompetence raises ambulatory venous pressure at the gaiter area.
Why is the great saphenous vein used as a bypass graft?
It is long, superficial, easily harvested, and has a calibre matching coronary and femoropopliteal arteries — the standard autogenous conduit in coronary and peripheral bypass surgery.