Course 1
Female Sex Organs
External Sex Organs
Internal Sex Organs
Homologous
Menstrual Cycle
Breasts
Significance
Male Breasts
The Breasts
性器官-女性性器官
The Sex Organs - The Female Sex Organs
乳房   The Breasts
 
形態與功能
儘管從術語的狹義理解,女性的圓圓乳房不能被認為是性器官,它們不僅在性欲喚起而且在新生兒養育中起著重要的作用。從某種意義上說,我們可以認為乳房具有性愛和生殖的功能。成年婦女的兩個乳房是兩個包繞乳腺的脂肪與結締組織的軟墊。只要生育孩子,乳腺就會開始分泌乳汁,並由導管引導到乳頭。乳頭由平滑肌纖維組成,含有許多神經末梢,對觸覺非常敏感,而且在性興奮時能夠勃起。環繞乳頭的區域(乳暈)呈桃紅色(這是白種人的顏色,黃種人的呈談褐色——譯者注),但是懷過孕後,顏色會變深,而且不再變淡。在青春期,由於激素刺激的原因,女性的乳房開始充分地發育起來。乳房的最後形狀和大小取決於遺傳因素。
 
 
左:女性乳房矢狀橫斷面觀;右:A.首次懷孕之前的乳頭(乳暈為桃紅色),B.首次懷孕之後的乳頭(乳暈為褐色)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.
[Course 1] [Female Sex Organs] [External Sex Organs] [Internal Sex Organs] [Homologous] [Menstrual Cycle] [Breasts] [Significance] [Male Breasts]