<prompt> A 38 year old man confides to his physician that he is experiencing erectile dysfunction. After a thorough evaluation the physician finds no organic basis for the symptoms and then prescribes tadalafil. Tadalafil inhibits phosphodiesterase type 5 and causes tumescence. Venous blood exiting the tissues impacted by the prescribed medication will first enter which of the following ?External pudendalDeep dorsalInternal pudendalSuperficial dorsal  <response>: The deep dorsal vein2 of the penis drains blood from the erectile tissues. The external pudendal vein1 receives blood from the skin and subcutaneous tissues of the penis but not the erectile tissues. The internal pudendal veins3 do not directly receive blood from the erectile tissues. Small veins of the deep dorsal vein may communicate with the internal pudendal vein in the pelvis. The superficial dorsal vein4 of the penis drains the skin and subcutaneous tissues of the penis It joins the external pudendal vein which, in turn, joins the great saphenous vein. Note: Deep penile Bucks fascia separates - deep dorsal vein and aery lying deep and superficial dorsal vein and aery lying superficial to it. 