Search results
Results From The WOW.Com Content Network
Structures opening in the vulval vestibule are the urethra (urinary meatus), vagina, Bartholin's glands, and Skene's glands. [1]The external urethral orifice is placed about 25–30 millimetres (1–1.2 in) [2] behind the clitoris and immediately in front of that of the vagina; it usually assumes the form of a short, sagittal cleft with slightly raised margins.
The bladder has three openings. The two ureters enter the bladder at ureteric orifices, and the urethra enters at the trigone of the bladder. These ureteric openings have mucosal flaps in front of them that act as valves in preventing the backflow of urine into the ureters, [6] known as vesicoureteral reflux.
In females (specifically primates and rodents), separate orifices have evolved for all three, while males discharge urine and semen from the urethra through a common urinary meatus. [1] In marsupials [3] [4] and most placentals, the female urethra and vagina open into a urogenital sinus with a common urogenital opening (vulvar opening in ...
Female marsupials have two lateral vaginas, which lead to separate uteri, but both open externally through the same orifice; [243] a third canal, which is known as the median vagina, and can be transitory or permanent, is used for birth. [244] The female spotted hyena does not have an external vaginal opening.
[2] [3] Although there remains debate about the function of the Skene's glands, one purpose is to secrete a fluid that helps lubricate the urethral opening. [2] [3] Skene's glands produce a milk-like ultrafiltrate of blood plasma. The glands may be the source of female ejaculation, [3] [4] [5] but this has not been proven. [4]
The openings of the Bartholin's glands are located on the posterior margin of the introitus bilaterally in a groove between the hymen and the labium minus at the 4:00 and 8:00 o'clock positions. The glands duct opening is seen on the posterolateral aspect of the vestibule 3 to 4 mm outside the hymen or hymenal caruncles lateral to the hymenal ...
The perineum attaches across the gap between the inferior pubic rami bilaterally and the perineal body. This grouping of muscles constricts to close the urogenital openings. The perineum supports and functions as a sphincter at the opening of the vagina. Other structures exist below the perineum that support the anus. [3] [6]
The trigone (also known as the vesical trigone) [1] is a smooth triangular region of the internal urinary bladder formed by the two ureteric orifices and the internal urethral orifice.