The vagina is a deflated tube
that is 5 to 10 centimeters in length and 1.9 cm in width. It has the ability
to expand and stretch when necessary. For example, during sexual intercourse,
the vagina swells to approximately 10 to 20 centimeters in length and 6 cm in
width.
It also forms the "birth
canal" and drains blood during menstruation. The vagina normally contains
various yeast and bacteria, which is necessary to maintain its health. During
intercourse, the vagina produces
a slippery clear discharge that acts as a lubricant with a noticeable smell.
The distal part of the vagina constricts by the levator ani muscles.
Above the pelvic floor, the vagina is much
more capacious and distensible. The Bartholin glands are a pair of
mucus-secreting glands, approximately 1 cm in diameter and drain through a
narrow duct that is approximately 2.5 cm in length in the posterior wall of the
vagina. They release secretions that moisten of the vagina and release
additional moisture when a woman becomes sexually aroused.
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