The female =urethra= (Urethra feminina) represents only that part of the
canal of the male which lies between the internal urethral orifice and
the openings of the ejaculatory ducts. Its length is about two inches (5
cm.), and its lumen is sufficient to admit of the introduction of the
finger; it is, however, capable of remarkable dilatation if sufficient
care and patience are exercised in the process. It lies centrally on the
pelvic floor, and is related and attached dorsally to the vagina.
=Structure.=—The intrinsic =muscular coat= consists of longitudinal and
circular layers of unstriped fibers. Between these is a layer of areolar
tissue which contains a rich =venous plexus=. The =mucous membrane= is
thrown into longitudinal folds when the canal is closed; it is highly
elastic, and is covered with stratified epithelium.
The =urethral muscle= (M. compressor urethræ) embraces the urethra and
is continued backward for some distance under the constrictor vestibuli.
It is covered by a fibro-elastic membrane.