Superficial Veins of Upper Limb (Left)
Venae superficiales membri superioris
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The superficial veins of the upper limb sit within the superficial fascia, or subcutaneously, and can be seen with the naked eye. They begin as the superficial veins of the hand and empty into the major superficial veins, such as the cephalic, basilic, and median antebrachial veins. The superficial venous pattern is highly variable and additionally there are many vessels connecting the superficial and deep venous drainage systems in the upper limb.
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Vein
A venous sinus is a vein with a thin wall of endothelium that is devoid of smooth muscle to regulate its diameter.