The dartos is a layer of tissue beneath the scrotum and the labia majora. Here of course, I’ll focus on that of the scrotum.
The dartos is responsible for the expanding and contracting scrotal skin tends to do, and this helps regulate temperature (which of course, is important for sperm production). It works in conjunction with the cremaster muscle, which elevates and lowers the testicles for similar reasons.
Apparently in the elderly, the dartos loses some tone, and causes a smoother scrotum that hangs down farther. I never knew that before. Even I’m learning from this!
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