NSE 13A/B Chapter Notes - Chapter 21: Subclavian Vein, Varicose Veins, Ulnar Artery
27 Mar 2017
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Ischemia: deficiency in supply of oxygenated arterial blood to a tissue caused by obstruction of. Ulnar and radial: distally, form 2 arches supplying the hands. Superficial and deep palmar arches: radial = medial to radius at wrist, ulnar = same relation to ulna, deeper, harder to palpate. Femoral : passes under inguinal ligament travels down thigh. Posterior tibial: travels down behind medial malleolus and divides into plantar arteries. Dilated and tortuous (varicose: enlarged or twisted) veins have incompetent veins. Incompetent valves: is so wide the valve cusps cannot approximate. Intraluminal valves ensure unidirectional flow: opens towards heart, closes when filled to prevent backflow. Clot in deep vein = bad bc it provides more circulation. Superficial: vein can be covered w/ other veins if cut unlike deep vein. Superficial: subcutaneous tissue, responsible for most venous return, varicose veins have bad valves. Deep veins: run alongside arteries, responsible for most venous return from legs, femoral/popliteal viens, can be excised w/o harming circulation.
