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For the obsolete dinosaur fossil name, see Megalosaurus Â§ Scrotum humanum. The scrotum is an anatomical male reproductive structure that consists of a suspended dual-chambered sack of skin and smooth muscle that is present in most terrestrial male mammals and located under the penis. One testis is typically lower than the other, which functions to avoid compression in the event of impact.
The pampiniform venous plexus may become tortuous and dilated, much like a varicose vein in the leg. In fact, a scrotal varicocele is simply a varicose enlargement of the pampiniform plexus above and around the testicle. Two other veins, the cremasteric and the deferential, also drain blood from the testicles; however, they are rarely involved in the varicocele process. The image below illustrates the basic anatomy. A large varicocele is seen through the scrotal skin.