Vagina

From WikiMD
Jump to navigation Jump to search
Apple bitten.svg

WikiMD is a free medical encyclopedia and wellnesspedia moderated by medical professionals.

Human female internal reproductive system

The human vagina is a part of the female body. It is between the perineum and the urethra. Menstrual fluid (red, blood-filled liquid lost during menstruation) leaves the body through the vagina. During sexual intercourse, a penis is put into the vagina. During birth, the vagina opens to let the baby come out from the uterus. The vagina is reddish pink in color, though colors may vary.

The vaginal opening is much larger than the urethral opening.

Development

Between the ages of 9-15 years, the vagina and uterus become bigger. The uterus is the organ in which a baby grows. The vagina is a tube leading from the uterus to the outside of the body. The opening of the vagina is inside the vulva, between the legs. A clear or whitish fluid may start to flow out of the vagina to keep it clean.[1]

Location

The opening to the vagina is located behind the urethral opening and in front of the perineum

The vagina is the tube leading from the uterus to the outside of the body. The opening is between the legs, inside the labium, behind the opening to the urethra, and in front of the anus.

Anatomy

The vagina is an elastic, muscular tube. It starts at the cervix and ends at the vulva.[2] It is about 6 to 7.5 centimetres (2.4 to 3.0 in) wide, and 9 centimetres (3.5 in) long.[3] During sexual intercourse and childbirth, the vagina gets wider and bigger.[4] It has to be lubricated to stay clean and allow sexual intercourse and childbirth. It is lubricated partially by the Bartholin's glands. This lubrication also allows sperm easier access to fertilize an ovum.

The vaginal biome

The cervix

Like many tissues, the vagina has a natural biome, a flora and fauna of microscopic organisms. The vagina is an interface between the host and the environment. Its surface is covered by a protective epithelium where bacteria and other microorganisms grow. The ectocervix (that's the vaginal part of the cervix) is not sterile,[5] but the endocervix (that's the canal of the cervix) and the upper genital tract are assumed to be sterile in healthy women. So, the cervix is a gatekeeper to protect the upper genital tract (ovaries and fallopian tubes) from microbes.

Research on this biome is at an early stage. Lactobacillus species are associated with vaginal health, but what they do to keep the vagina healthy is not known. A big research program into this is part of the Human Microbiome Project (HMP).[6]

Functions

Release

The vagina releases blood and tissue during menstruation. Tampons or other products can be used to absorb some of the blood.[7]

Sexual activity

When a woman is aroused, she has pleasurable feelings in her genital region. The vagina gets up to 8.5 centimetres (3.3 in) wide. It can get bigger with more stimulation.[8] During sexual intercourse, the man's penis is placed in the woman's vagina. The vagina is warm and soft, and it places pressure on the man's penis. That can feel good for both partners and usually makes the man have an orgasm after repeated thrusts. For orgasm in women, the vagina has significantly fewer nerve endings than the clitoris, and therefore rubbing or applying other consistent pressure against the clitoris is usually needed to help the woman have an orgasm.[9][10] During the man's orgasm, he ejaculates semen from his penis into the vagina. The semen contains sperm. The sperm can move from the vagina into the uterus to fertilize an egg and make a woman pregnant.

The G-spot may be a highly sensitive area near the entrance inside of the human vagina.[11] If stimulated, it leads to a strong orgasm or female ejaculation in some women.[12][13][14] Some doctors and researchers who specialize in the anatomy of women believe that the G-spot does not exist, and that if it does exist, it is an extension of the clitoris.[15][16][17][18]

Childbirth

During birth, the vagina acts as a pathway for the baby to leave the mother's body. The vagina is very elastic and stretches to many times its normal diameter during birth.

Pregnancy

Sperm needs to be deposited at the top of the vagina near the cervix and fertilize the ovum (egg) if pregnancy is to occur. In a normal childbirth, babies come out through the vagina.

Related pages

References

  1. Marshall, Human Growth, p. 187.
  2. http://www.womenshealth.gov/glossary/#vagina Womenshealth.gov
  3. Gray's Anatomy
  4. "The sexual response cycle". EngenderHealth. Retrieved 2007-10-13.
  5. 'sterile' here means having no biome on the surface.
  6. Fettweis, Jennifer M. et al 2011. The vaginal microbiome: disease, genetics and the environment. [1]
  7. "All about Menstruation". Retrieved 2010-05-14.
  8. "Does size matter". TheSite.org. Retrieved 2006-08-12.
  9. Darling, CA; Davidson, JK; Conway-Welch, C. (1990). "Female ejaculation: perceived origins, the Grafenberg spot/area, and sexual responsiveness". Arch Sex Behav. 19: 29–47. doi:10.1007/BF01541824.CS1 maint: multiple names: authors list (link)
  10. Jannini E, Simonelli C, Lenzi A (2002). "Sexological approach to ejaculatory dysfunction". Int J Androl. 25 (6): 317–23. doi:10.1046/j.1365-2605.2002.00371.x. PMID 12406363.CS1 maint: multiple names: authors list (link)
  11. Jannini E, Simonelli C, Lenzi A (2002). "Disorders of ejaculation". J Endocrinol Invest. 25 (11): 1006–19. PMID 12553564.CS1 maint: multiple names: authors list (link)
  12. Hines, T (August 2001). "The G-Spot: A modern gynecologic myth". Am J Obstet Gynecol. 185 (2): 359–62. doi:10.1067/mob.2001.115995.
  13. O'Connell HE, Sanjeevan KV, Hutson JM (October 2005). "Anatomy of the clitoris". The Journal of Urology. 174 (4 Pt 1): 1189–95. doi:10.1097/01.ju.0000173639.38898.cd. PMID 16145367. Time for rethink on the clitoris Lay summary Check |laysummary= value (help)BBC News (11 June 2006). Cite uses deprecated parameter |laysummary= (help)CS1 maint: multiple names: authors list (link)
  14. Kilchevsky A, Vardi Y, Lowenstein L, Gruenwald I (January 2012). "Is the Female G-Spot Truly a Distinct Anatomic Entity?". The Journal of Sexual Medicine. 2011. doi:10.1111/j.1743-6109.2011.02623.x. PMID 22240236. G-Spot Does Not Exist, 'Without A Doubt,' Say Researchers - Lay summary Check |laysummary= value (help)Huffington Post (January 19, 2012). Cite uses deprecated parameter |laysummary= (help)CS1 maint: uses authors parameter (link)
  15. Alexander, Brian (January 18, 2012). "Does the G-spot really exist? Scientists can't find it". MSNBC.com. Retrieved March 2, 2012.
Wikipedia

Other websites

  • Pink Parts - More information on female sexual anatomy.

Template:Reproductive system

W8MD weight loss logo

Ad. Tired of being overweight?. W8MD's insurance Weight loss program can HELP*

Weight loss tips | Lose weight King of Prussia, PA | W8MD's medical weight loss | Lose weight New York City | Lose weight Philadelphia | Lose weight NYC | Weight loss Brooklyn NY | Advertise

Quick links: Medicine Portal | Encyclopedia‏‎‏‎ | Gray's Anatomy‏‎ | Topics‏‎ |‏‎ Diseases‏‎ | Drugs | Wellness | Obesity‏‎ | Metabolic syndrome | Weight loss*
Disclaimer: The entire contents of WIKIMD.ORG are for informational purposes only and do not render medical advice or professional services. If you have a medical emergency, you should CALL 911 immediately! Given the nature of the wiki, the information provided may not be accurate, misleading and or incorrect. Use the information on this wiki at your own risk! See full Disclaimer.
Link to this page: <a href="http://www.wikimd.org/wiki/Vagina">Vagina</a>

  • Individual results may vary for weight loss from our sponsors.