|
性器官-女性性器官
The Sex Organs - The Female Sex Organs
|
|
乳房
The Breasts
|
|
形态与功能
尽管从术语的狭义理解，女性的圆圆乳房不能被认为是性器官，它们不仅在性欲唤起而且在新生儿养育中起着重要的作用。从某种意义上说，我们可以认为乳房具有性爱和生殖的功能。成年妇女的两个乳房是两个包绕乳腺的脂肪与结缔组织的软垫。只要生育孩子，乳腺就会开始分泌乳汁，并由导管引导到乳头。乳头由平滑肌纤维组成，含有许多神经末梢，对触觉非常敏感，而且在性兴奋时能够勃起。环绕乳头的区域（乳晕）呈桃红色（这是白种人的颜色，黄种人的呈谈褐色——译者注），但是怀过孕后，颜色会变深，而且不再变淡。在青春期，由于激素刺激的原因，女性的乳房开始充分地发育起来。乳房的最后形状和大小取决于遗传因素。 |
|
|
|
|
|
左：女性乳房矢状横断面观；右：A.首次怀孕之前的乳头（乳晕为桃红色），B.首次怀孕之后的乳头（乳晕为褐色）。Left: Cross section of a female breast. Right: A: Nipples before the first pregnancy. (Areola is pinkish.) B: Nipples after the first pregnancy. (Areola is brownish.)
|
|
|
|
The Breasts
|
Form and function
Although the rounded female breasts cannot be considered sex organs in the narrow sense of the term, they usually play an important part not only in erotic arousal, but also in the nurturing of the newborn. In a sense then, the breasts can be said to have some erotic as well as reproductive function. The breasts of a mature woman are two cushions of fat and tissue which surround her mammary glands. Whenever she gives birth to a child, these glands begin to secrete milk into special ducts leading to the nipples. The nipples, which are composed of smooth muscle fiber, and which contain many nerve endings, are very sensitive to the touch and can become erect during sexual excitement. The area around the nipples (areola) is pinkish, but becomes-and then remains-darker as a result of pregnancy. The female breasts begin to develop fully during puberty as a result of hormonal stimulation. Their eventual shape and size is determined by heredity. |
