Where is the vgina?

女性生殖系統

圖片參考：http://www.socialwork.com.hk/child/image/3-1.gif

1.女性外生殖器
恥阜位於恥骨接合處的前方，由皮下脂肪組織構成，有恥毛覆蓋。
大陰脣位於恥阜下端，共有兩條向下、向後延伸的皮膚皺摺物，其中含有脂肪組織、汗腺和皮脂腺，相當於男性的陰囊，其外表上半部有恥毛覆蓋。
小陰脣位於大陰脣的內側，共有兩個較小的皮膚皺摺物，不含脂肪組織及毛髮。
陰蒂位在左、右大陰脣上半部會合處，其作用相當於男性的陰莖，其中有可以充血而勃起的海綿組織及神經、受到觸覺刺激時會勃起、脹大。
前庭是介於大陰脣之間的裂縫，裡面有陰道口、尿道口、處女膜、大前庭腺及小前庭腺。處女膜位在陰道出口處，一般可分為篩狀、環狀及中隔狀三種，會因性交、運動碰撞而破裂，破裂時不一定會流血。大小前庭腺在性交時會分泌黏液，幫助潤滑。
尿道口位於陰蒂和陰道口之間，是尿道在身體表面的出口，泌尿系統的最末端部份，是把尿液排出體外的通道。
(附女性外生殖系統解剖圖並標示各器官名稱)
女性內生殖器

圖片參考：http://www.socialwork.com.hk/child/image/2-1.gif

卵巢又稱為女性性腺，是一成對的腺體，以韌帶固定在子宮兩側，位於骨盆的後方，輸卵管的下方，能產生成熟的卵子、排卵、並分泌女性性激素(分為雌性激素及黃體激素)。
輸卵管連接卵巢與子宮，能將未受精或已受精之卵子送往子宮，也是卵子受精作用的發生位置。
子宮位於膀胱與直腸之間，外型像一個倒立的梨子，可細分為子宮底、子宮體、子宮頸。子宮底是位於輸卵管的圓頂部，向下逐漸變細的中央部份是子宮體，子宮頸則是再向下延伸至陰道的部份。子宮的功能是造成月經，或是提供受精卵著床發育，以及生產的進行。
陰道在尿道的下方，它連接子宮和外生殖器，是月經排出體外的通道，也是性交時容納陰莖的部位以及產道的下半部。

The vagina, (from Latin, literally "sheath" or "scabbard" ) is the tubular tract leading from the uterus to the exterior of the body in female placental mammals and marsupials, or to the cloaca in female birds, monotremes, and some reptiles. Female insects and other invertebrates also have a vagina, which is the terminal part of the oviduct. The Latinate plural (rarely used in English) is vaginae.
In common speech, the term "vagina" is often used inaccurately to refer to the vulva or female genitals generally; strictly speaking, the vagina is a specific internal structure and the vulva is the exterior genitalia only.





Contents[hide]

1 Anatomy
2 Functions of the vagina
3 Menstruation
4 Sexual activity
5 Giving birth
6 Sexual health and hygiene
7 The vagina and popular culture
8 Additional images
9 See also
10 External links



Anatomy


圖片參考：http://upload.wikimedia.org/wikipedia/commons/thumb/6/61/Female_anatomy_frontal.png/180px-Female_anatomy_frontal.png



圖片參考：http://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png
Schematic frontal view of female anatomy.
The human vagina is an elastic muscular tube projecting inside a female. It is usually slightly shorter and thinner than an average male penis, at about 4 inches (100 mm) long and 1 inch (25 mm) in diameter (although there is wide anatomical variation) but its elasticity causes it to be able to accept larger penises and give birth to offspring. It connects the vulva at the outside to the cervix of the uterus on the inside. If the woman stands upright, the vaginal tube points in an upward-backward direction and forms an angle of slightly more than 45 degrees with the uterus. The vaginal opening is at the back (caudal) end of the vulva, behind the opening of the urethra. Above the vagina is Mons Veneris. The vagina, along with the inside of the vulva, is reddish pink in color, as with most healthy internal mucous membranes in mammals.
Length, width and shape of the vagina may vary. When a woman gives birth and during sexual intercourse, the vagina temporarily widens and lengthens.[1]
Vaginal lubrication is provided by the Bartholin's glands near the vaginal opening and the cervix and also seeps through the vaginal wall (which does not contain any glands).
The hymen (a membrane situated at the opening of the vagina) partially covers it in many organisms, including many human females, from birth until it is ruptured by sexual intercourse, or by any number of other activities including medical examinations, injury, certain types of exercise, introduction of a foreign object, etc. However, it should be noted that sexual intercourse does not always cause the hymen to be broken, and so (for example) it is not true that a woman with an intact hymen must be a virgin or vice versa.

Functions of the vagina
From a biological perspective, the vagina performs the following functions:

Providing a path for menstrual fluids to leave the body.
Sexual activity
Giving birth

Menstruation
The vagina provides a path for menstrual fluids to leave the body. In modern societies, tampons, menstrual cups and sanitary towels may be used to absorb or capture these fluids.
Sexual activity
The concentration of the nerve endings that lie particularly close to the entrance of a woman's vagina can provide pleasurable sensation during sexual activity, when stimulated in a way that the particular woman enjoys. This activity may include heterosexual intercourse, during which a male partner's penis is placed within the vagina, manual stimulation (either self, or partner), or other stimulation such as tribadism. An erogenous zone referred to commonly as the G-spot is located at the anterior wall of the vagina, about five centimeters in from the entrance. Some women can experience very intense pleasure if the G-spot is stimulated appropriately during intercourse or other sexual activity. A G-Spot orgasm may be responsible for female ejaculation.