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In the penis, the loose attachment of the dartos fascia to Buck's fascia is responsible for the high degree of mobility of the penile skin over the underlying tissue.<ref name=Campbell10 /> It is also responsible for carrying the blood supply of the penile skin, a longitudinally-coursing anastomotic network of vessels that arise from the external pudendal vessels.<ref name=Campbell10 />
In the scrotum, the tunica dartos acts to regulate the [[temperature]] of the [[testicle]]stesticles, which promotes [[spermatogenesis]]. It does this by expanding or contracting to wrinkle the scrotal skin.
* Contraction reduces the [[area|surface area]] available for heat loss, thus reducing [[heat]] loss and warming the testicles.
* Conversely, expansion increases the surface area, promoting heat loss and thus cooling the testicles.