Keeping Cool
Function:
The scrotum is the thick-skinned sac that surrounds and protects the testes. The scrotum also acts as a climate-control system for the testes because they need to be slightly cooler than body temperature for normal sperm development! The cremaster muscles in the wall of the scrotum relax to allow the testes to hang farther from the body to cool or contract to pull the testes closer to the body for warmth or protection.
Fun Fact:
Scrotum hold the testicles outside of the body,” which helps to keep the testicles cooler than body temperature.
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