- 产生能通过生殖管道系统射出的精子。
- 分泌直接进入血液的激素。
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The
Internal Sex Organs: The Testicles
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Location, form and function
The testicles (male sex glands or gonads) are formed within the abdomen during the development of the embryo. However, before the birth of a baby boy they normally descend into his scrotum. In the mature male the testicles are two oval-shaped bodies of about 1 ½ inches (4 cm) in length which are suspended in two separate sacs inside the scrotum outside the abdominal cavity. Although both testicles are of about the same size, the left one usually hangs a little lower and thus may give the appearance of being larger. The testicles serve a double function:
- They produce sperm which may be ejaculated through a system of genital ducts.
- They produce hormones which are secreted directly into the bloodstream.
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