|
The adult
vaginal anatomy is normally about 3 inches (7.5 cm) long and
slopes upward and backward. Internally, the bladder is in front
of the vagina and the rectum RECTUM in back. The vagina receives
the erect penis in coitus; spermatozoa are discharged into it,
swim through the cervical canal, and enter the uterus. The vagina
is also the passage for menstrual discharge, and it functions
as the birth canal.
anatomy
of the vagina
The interior
lining of the vagina is mucous membrane; muscles and fibrous
tissue form its walls. In pregnancy, changes occur in these
tissues, enabling the vagina to stretch to many times its usual
size during labor and childbirth. In a virgin, the opening of
the vagina is usually, but not necessarily, partially closed
by a membrane, the "hymen" HYMEN. Usually the hymen
breaks at first intercourse; occasionally it ruptures during
physical exercise.
In a normal
state, the lining of the vagina secretes a fluid that is fermented
to an acid by the bacteria that are usually present. This acidity
probably helps to protect the vagina from invasion by other
organisms.
Douching as a regular practice should not be employed except
when recommended by a health care provider.
vaginal
anatomy
|
