The cremaster muscles work in concert with the pampiniform plexus that surrounds the testicular ...

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B

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The location of the testes in the scrotum is important for sperm production, which is optimal at 2 C to 3 C below body temperature. Two systems maintain the temperature of the testes at a level consistent with sperm production. One is the pampiniform plexus of testicular veins that surround the testicular artery. This plexus absorbs heat from the arterial blood, cooling it as it enters the testes. The other is the cremaster muscles. These muscles respond to decreases in testicular temperature by moving the testes closer to the body.