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Fastag gy tastag gexaúpR 02, 2010 4 pagos Human anatomy The human vagina is an elastic muscular canal that extends from the cervix to the vulva. [l] Although there is Wide anatomical variation, the length of the unaroused vagina is approximately 6 to 7. 5 cm (2. 5 to 3 in) across the anterior Wall (front), and 9 cm (3. 5 in) long across the posterior Wall During sexual arousal the vagina expands in both length and width. [3] Its elasticity allows it to stretch during sexual intercourse and during birth to offspring. 4] he vagina connects the superficial vulva to the cervix of the deep uterus. 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 caudal end of the vulva behind the o enin ofthe urethra. The upper one-fourth of t ora the rectouterine pou A. vagina, along with th side as with most healthy series of ridges prod rom the rectum by he Mons pubis. The ddish Pink in color, anes in mammals. A II of the outer third of the female vagina is called vaginal

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The Swlpe to vlew next page They are transverse epithelial ridges and their function is to rovide the vagina with increased surface area for extension and stretching. Vaginal lubrication is provided by the Bartholin’s glands near the vaglnal opening and the cervix. The membrane of the vaginal Wall also produces moisture, although it does not contain any glands. Before and during ovulation, the cervixis mucus glands secretes different variations of mucus, which provides a favorable alkaline environment in the vaginal canal to maximize the chance of survival for sperm.

The hymen is a thin membrane of connective tissue which is situated at the opening of the vagina. As with many female nimals, the hymen covers the opening of the vagina from birth until It is ruptured during sexual or non-sexual activity. The tissue may be ruptured by vaginal penetration, a pelvic examination, injury, or sports. The absence of a hymen does not indicate prior sexual activity, as it is not always ruptured during sexual intercourse. 5] Similarly, the presence does not indicate a lack of prior sexual activity, as it is possible for light activity to not rupture it, or for it to be surgically restored. Physiological functions of the vagina The vagina has several biological functions. Sexual activity The concent functions of the vagina The concentration of the newe endings that lie 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.

During sexual arousal, and particularly the stimulation of the clitoris, the walls of the vagina self-lubricate. This reduces friction that can be caused as a result of various sexual activities. Research has found that portions of the clitoris extend into the vulva and vagina. [6] With arousal, the vagina lengthens rapidly to an average of about 4 in. 10 cm), but can continue to lengthen in response to pressure. [7] As the woman becomes fully aroused, the vagina tents (last Z) expands in length and width, while the cervix retracts. 8] The walls of the vagina are composed of soft elastic folds of mucous membrane skin which stretch or contract (with support from pelvic muscles) to the size of the inserted penis or other object. G-spot Main article: G-spot An erogenous zone referred to commonly as the G-spot (also known as the Gráfenberg spot) is located at the anterior Wall of the vagina, about five centimeters in from the entrance. Some women experience intense pleasu Lvf4 vagina, about flve centimeters in from the entrance.

Some women experience intense pleasure if the G-spot is stimulated appropriately during sexual activity. A G-Spot orgasm may be responsible for female ejaculation, leadlng sorne doctors and researchers to believe that G-spot pleasure comes from the Skene’s glands, a female homologue ofthe prostate, rather than any particular spot on the vaginal 0][1 1] Some researchers deny the existence of the G-spot. [12] Childbirth During childbirth, the vagina provides the channel to deliver the infant from the uterus to its independent life outside the body of he mother.

During birth, the elasticity of the vagina allows it to stretch to many times its normal diameter. The vagina is often typically referred to as the birth canal in the context of pregnancy and childbirth, though the term is, by definition, the area between the outside of the vagina and the fully dilated uterus. [13] Uterine secretions The vagina provides a path for menstrual blood and tissue to leave the body. In industrial societies, tampons, menstrual cups and sanitary napkins may be used to absorb or capture these fluids. Las piedras rodando se encuentran