Urinary Meatus
The urinary meatus (/miːˈeɪtəs/, mee-AY-təs; pl.: meatus or meatuses), also known as the external urethral orifice, is the opening where urine exits the male and female urethra.
It is where semen also exits the male urethra. The meatus has varying degrees of sensitivity to touch.
| Urinary meatus | |
|---|---|
 Human urinary meatus on the male glans penis (left) and in the female vulval vestibule (right) | |
| Details | |
| Part of | Penis or vulva |
| Identifiers | |
| Latin | ostium urethrae externum |
| FMA | 19650 |
| Anatomical terminology | |
In human males
The male external urethral orifice is the external opening of the urethra, normally located at the tip of the glans penis, at its junction with the frenular delta. It presents as a vertical slit, possibly bounded on either side by two small labia-like projections, and continues longitudinally along the front aspect of the glans, which facilitates the flow of urine micturition. In some cases, the opening may be more rounded. This can occur naturally or may also occur as a side effect of excessive skin removal during circumcision. The meatus is a sensitive part of the male reproductive system.
In human females
The female external urethral orifice is the external opening of the urethra, from which urine is ejected during urination. It is located about 2.5 cm (1 in) behind the clitoris and immediately in front of the vaginal opening in the vulval vestibule. It usually assumes the form of a short, sagittal cleft with slightly raised margins. To its left and right are the openings of the Skene's glands.
Some evidence exists to suggest that the clitoral-urinary meatus distance (CUMD) in human females relates to the ease with which the female may achieve orgasm through penetrative sex. Orgasm from penetration alone is observed to be more likely as CUMD decreases.
Evidence also suggests that decreased distance from the vaginal opening to the urethral meatus is associated with recurrent post-coital urinary tract infections. Surgical repositioning of the distal urethra to prevent recurrent post-coital urinary tract infections has been employed with some success by Russian physicians.
In other mammals
Unlike most other mammals (including human), female spotted hyenas have a urinary meatus that is located on the clitoral glans.
Clinical significance
Congenital disorders of the meatus, in the male, include epispadias (the misplacement to the upper aspect) and hypospadias (the misplacement to the underside of the penis). A congenital misshaping can result in its narrowing (meatal stenosis), causing a partial or total urinary blockage or the bifurcation of the urinary stream. A urethral blockage can also be caused by foreign material, kidney stones, or bladder stones (lithiasis).
See also
Notes
References
This article uses material from the Wikipedia English article Urinary meatus, which is released under the Creative Commons Attribution-ShareAlike 3.0 license ("CC BY-SA 3.0"); additional terms may apply (view authors). Content is available under CC BY-SA 4.0 unless otherwise noted. Images, videos and audio are available under their respective licenses.
®Wikipedia is a registered trademark of the Wiki Foundation, Inc. Wiki English (DUHOCTRUNGQUOC.VN) is an independent company and has no affiliation with Wiki Foundation.