You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Course of the great saphenous vein lies in what relation to the malleoli and explain in detail?
GREAT SAPHENOUS VEIN:- Lie on the dorsum of the foot.Recieves 4 dorsal metatarsal veins.Formed by union of medial end of dorsal venous arch with the medial marginal vein and drains the medial side of great toe.Passes upwards of medial malleolus (2.5cm in front) ,crosses the lower one-third of the medial surface of the tibia obliquely, and runs along medial border to reach the back of the knee.Thigh- it inclines forward to reach the saphenous opening where it pierces the cribriform fascia and opens into femoral vein. Contains 10-15 valves to prevent backflow of venous blood. Incompetence of these valves makes vein dilated and touous leading to varicose veins. The vein is connected to deep veins of limb perforator veins. 3 medial perforators-just above ankle.1 perforator just below knee 1 in the region of adductor canal. The perforating veins are also provided with valves which permit flow of blood only from superficial to deep. {Reference: BDC.6E }