Vagina
The vagina is the opening that is located directly below the urethral opening (where you pee from). The opening is called an orifice, as are other openings in your body.The vagina is a muscular, highly expandable, tubular cavity leading from the vestibule to the uterus. The vagina is the structure penetrated during vaginal intercourse, and it serves as an exit channel for menstrual flow. During vaginal intercourse, contact with this structure provides sexual pleasure in some women. The anterior vaginal wall is more densely innervated and more highly sensitive to stimulation than the posterior vaginal wall.
The average vaginal canal is three inches long, possibly four in women who have given birth. This may seem short in relation to the penis, but during sexual arousal the cervix will lift upwards and the fornix may extend upwards into the body as long as necessary to receive the penis. After intercourse, the contraction of the vagina will allow the cervix to rest inside the fornix, which in its relaxed state is a bowl-shaped fitting perfect for the pooling of semen.
The size of the vaginal orifice varies inversely with that of the hymen. The orifice is capable of expansion during coitus and delivery. The ducts of the greater vestibular glands open on each side of the vaginal orifice, between it and the labia minora. With a decrease in oestrogen levels, the orifice becomes smaller.The vagina forms an angle of about 90 degrees with the uterus. The anterior wall is about 7.5 cm long and the posterior wall about 9 cm long. In a nulliparous adult the vagina is H-shaped in section with transverse ridges or folds called vaginal rugae. The walls of the vagina are highly distensible. Part of the cervix protrudes into the vagina. The recess between the vaginal part of the cervix and the vaginal walls is termed the fornix.
The anterior fornix is the recess between the cervix and the anterior wall of the vagina and it is related to the bladder base and the fossa between the bladder and the uterus. The posterior fornix is the recess between the cervix and the posterior wall of the vagina. The posterior fornix is related to the recto-uterine pouch. It is deeper than the anterior fornix because of the angle that the cervix makes with the vagina. It is the site where semen collects after ejaculation. The lateral fornices are found between the lateral walls of the vagina and the cervix. Before puberty the rugae are absent. In the elderly, the vagina becomes narrower and less deep. The wall is less elastic and appears pale and smooth due to loss of rugae.
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