Scrotum
The scrotum is a cutaneous sac that conforms in size and shape to the testes it contains. The scrotal skin is thin, pliable, and relatively hairless (except in some breeds of sheep, in which fleece covers the scrotum).
A layer of fibroelastic tissue mixed with smooth muscle fibers, called the tunica dartos, lies immediately under the skin. During exposure to cold the muscle fibers of the tunica dartos contract and assist in holding the testes against the abdominal wall. The tunica dartos sends a fibrous sheet into the median plane between the two testes to form the scrotal septum, which divides the scrotum into two compartments, one for each testis. Deep to the tunica dartos are several layers of fascia, which are not easily separated. The internal abdominal oblique muscle contributes a slip of muscle that lies on the spermatic cord. This is the cremaster muscle, which also assists with drawing the testicle closer to the body wall when ambient temperatures are low or as a protective reflex.
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