The female urethra is a narrow membranous canal, about 4 cm. long, extending from the internal to the external urethral orifice.
It is placed behind the symphysis pubis, imbedded in the anterior wall of the vagina, and its direction is obliquely downward and forward; it is slightly curved with the concavity directed forward. It begins after the internal urethrla orifice with an intramural part in the muscular wall of the urinary bladder.
Its diameter when undilated is about 6 mm.
It perforates the fasciæ of the urogenital diaphragm, and its external orifice is situated directly in front of the vaginal opening and about 2.5 cm. behind the glans clitoridis.
The lining membrane is thrown into longitudinal folds, one of which, placed along the floor of the canal, is termed the urethral crest.
Many small urethral glands open into the urethra.
Structure.—The urethra consists of three coats: muscular, erectile, and mucous.