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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 ...
The human female reproductive system is made up of the internal and external sex organs that function in the reproduction of new offspring. The reproductive system is immature at birth and develops at puberty to be able to release matured ova from the ovaries , facilitate their fertilization , and create a protective environment for the ...
The opening to the human vagina lies just below the urethral opening at the back of the vestibule. A 1996 study by Pendergrass et al. using vinyl polysiloxane castings taken from the vaginas of 39 Caucasian women, found the following ranges of dimensions: [3] lengths (measured using rods): 6.9 to 14.8 cm (2.7 to 5.8 in);
Vestibule/vulvar opening: In humans, other great apes, and some rodents, the vestibule is a flat and short external space that contains separate urethral and vaginal openings. In most other placentals, the urethra and vagina join as an internal vestibule ( urogenital sinus ), hence both urine and offspring exit through an orifice called the ...
In female canids, the vagina contracts during copulation, forming a copulatory tie. [246] Female cetaceans have vaginal folds that are not found in other mammals. [247] [248] Monotremes, birds, reptiles and amphibians have a cloaca and is the single external opening for the gastrointestinal, urinary, and reproductive tracts.
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.
[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 ...