This connective tissue covering of the testes also divides it into lobes
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The scrotum is the external sac of skin and subcutaneous tissue that contains the testes. It hangs from the trunk midline posterior to the penis. A medial partition keeps each testis in a separate chamber within the scrotum. Testes develop within the pelvic cavity but descend into the scrotum through the inguinal canals near the end of the seventh month of fetal development. This migration occurs under the stimulation of testosterone. The descent of the testes into the scrotum keeps their temperature 2-3°F below average body temperature. This lower temperature is necessary for the production of viable sperm.
The subcutaneous tissue of the scrotum contains a layer of smooth muscle called the dartos. Its cells reflexively contract or relax to shorten or lengthen the scrotum in response to temperature changes. In addition, there are two thin, ribbon-like skeletal muscles, named cremaster, that are attached to the testes and respond similarly. Through the actions of these muscles, the testes are elevated closer to the body in cold temperatures and depressed in warm temperatures.
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