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性器官-男性性器官
The
Sex Organs
- The Male Sex Organs
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男性外部性器官：阴囊
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阴囊是一个容纳睾丸的皮肤囊袋，它从阴茎的基部悬垂于两大腿之间。阴囊的皮肤色泽相对要深和含有许多腺体。其内部，有两个分隔的空间，每一个空间容纳一个睾丸及其精索。精索向上进入腹膜腔，它其中的一部分是一根较细的管道，为精子通过的输精管。输精管切除术恰恰切断的就是这根管道。精索也含有血管、神经和平滑肌。为了适应某些刺激，尤其是适应低温刺激，精索的平滑肌收缩，以提拉睾丸靠近腹部。与此同时，阴囊的皮肤也会收缩，使得皮囊变厚和出现皱褶。但是，通常情形下，阴囊松弛地悬垂着，其皮肤看起来薄薄的、滑滑的。从某种程度上看，阴囊像一个自动调温器一样发挥着作用，它试图在睾丸内为精子的持续产生调节出一个恰好的温度。这一温度必须略低于身体其余部位。 |
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The
External Sex Organs: The Scrotum
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The scrotum is a bag or pouch of skin which contains the testicles, and which hangs between the thighs at the base of the penis. The skin of the scrotum is comparatively dark and contains many sweat glands. Inside the scrotum there are two separate compartments, each of which contains one testicle and its spermatic cord which leads upward into the abdominal cavity. Part of this spermatic cord is a thin tube through which the sperm travels - the vas deferens. It is this vas deferens that is cut in a vasectomy. The spermatic cord also contains blood vessels, nerves, and muscles. In response to certain stimuli, especially cold temperatures, these muscles contract and pull the testicle closer to the abdomen. At the same time, the skin of the scrotum will also contract and appear thick and wrinkled. Ordinarily, however, the scrotum hangs loose, and its skin looks thin and smooth. In a way the scrotum acts like a thermostat, trying to provide an even temperature for the continuous production of sperm which is taking place inside the testicles. This temperature has to be slightly lower than that of the rest of the body. |
