Scrotum is a piece of skin, located behind the penis, with pigmentation, thin and soft. There is a partition in the middle to divide the scrotum into two chambers, each with testis, epididymis and vas deferens. There are many wrinkles on the scrotum, which can contract and expand, and can adjust the temperature around the testis (the temperature in the scrotum is lower than the body temperature 1.5-2c), which is beneficial to the production of sperm in the testis.

From the perspective of comparative anatomy, the gonads of male fish and birds are all in the body cavity, and there is no scrotum. Only the testis of male advanced mammals has scrotum outside the trunk cavity. This is an evolution that adapts the testes to hypothermia for spermatogenesis. The scrotal wall is a continuation of the abdominal wall, and the surface layer is skin without subcutaneous fat. Below the skin is the fleshy membrane tissue containing smooth muscle fibers. Seminal capsule, tunica vaginalis, muscularis and part of fascia extend into the deep part of the midline of scrotum, forming the scrotum diaphragm, which accommodates the left and right testicles respectively. The scrotal skin is thin and wrinkled, the wall is dark brown, and the pubic hair is sparse and curved. Scrotal skin is rich in sebaceous glands and apocrine glands. Its secretion can produce special odor after interacting with vulvar bacteria. Each capsule contains the corresponding testis, epididymis and spermatic cord scrotum. The ventral median crest or scrotum suture is the fusion line of embryonic reproductive eminence.

Chinese name

scrotum

Foreign name

scrotum

characteristic

Easy to shrink and stretch.

health

There are often many bacteria on the skin surface of scrotum.

disease

Pubic ulcer or hyperplasia, urethral abscess