Why are testicles cool?

The testicles of men are actually the most important reproductive organs in the male body, because they have many important responsibilities. First, the testicles are where sperm is produced and stored. Second, the testicles secrete some hormones, which are directly related to whether men have strong sexual ability. So the question is, why do testicles feel cold in daily life?

A cold scrotum is a normal phenomenon. Under normal circumstances, a man's testicular temperature is about 1-2 degrees lower than normal body temperature. The testicular temperature must be kept cold so that sperm can survive normally and sperm motility can reach normal standards.

There are many wrinkles on the scrotum, which are used to regulate the temperature of the testicles. When the temperature of the crotum is too high, the scrotum will sag, and the wrinkles will open to dissipate heat. When the temperature of the crotum is low, the scrotum will shrink to ensure the temperature of the testicles. Therefore, when you take a hot bath, you will see that the scrotum sags a lot, and the testicles also sag. When you swim, the water temperature is relatively low, and you will see that the scrotum shrinks tightly together, and it feels like you can't even see the testicles.

Therefore: It is recommended that boys should not wear tight underwear and outer pants to give the scrotum a space to dissipate heat, thereby ensuring the activity of sperm. In recent years, many boys cannot get pregnant normally after marriage. Routine semen examination will find that the sperm activity is lower than the normal index, leading to infertility, which is directly related to wearing tight underwear and outer pants.

The testicles are relatively sensitive to temperature. The optimum temperature for testicular sperm production is 32-36 degrees Celsius, which is 2-4 degrees lower than normal human body temperature. The scrotum is located at the bottom of the body, and its skin has many wrinkles and a strong heat dissipation capacity. The skin wrinkles of the scrotum properly bear the "heavy responsibility" of air conditioning heat dissipation and heating. It is extremely sensitive to external temperature changes. When the temperature drops, the smooth muscle and levator testis muscle in the scrotum contract, The testicles rise and the scrotum quickly contracts or has dense folds, which is good for heat preservation; when the temperature rises, the smooth muscle and the testicular organ stretch to the maximum, causing the testicles to descend and move away from the body. The scrotal skin becomes loose, and the fold density decreases, increasing the heat dissipation area, which is good for heat dissipation. It is through this regulatory effect that the internal temperature of the scrotum is 1.5~2℃ lower than that of the abdominal cavity, which is good for the growth and development of sperm.