Archive image from page 1342 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( THE MALE UEETHEA. 1309 opening into the canal, they lie for some distance immediately beneath its mucous membrane. A number of little pit-like recesses, called the lacunae urethrales, also open into the cavernous part of the urethra, and are so disposed that their openings lead for the most part obliquely into the canal in the direction of its external orifice. In some cases a somewhat valve-like fold of the mucous membrane, the valvula fossae navicul
Archive image from page 1342 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( THE MALE UEETHEA. 1309 opening into the canal, they lie for some distance immediately beneath its mucous membrane. A number of little pit-like recesses, called the lacunae urethrales, also open into the cavernous part of the urethra, and are so disposed that their openings lead for the most part obliquely into the canal in the direction of its external orifice. In some cases a somewhat valve-like fold of the mucous membrane, the valvula fossae navicularis, is found in the upper wall of the urethra in the region of the fossa navicularis. The free edge of this fold is directed towards the external urethral orifice, and may engage the point of a fine instrument introduced into the urethra. Structure.—The mucous membrane of the urethra contains numerous elastic fibres and varies in thickness in different parts of the canal. In many positions it shows distinct longitudinal folds and also minute depressions or pits—the lacunae urethrales, already mentioned. The lining epithelium is composed of many layers of cells, and is continuous through the internal urethral orifice with the epithelium of the bladder, which at first it closely resembles. In the region of the fossa navicularis the lining cells, which throughout the cavernous portion of the canal are of a columnar type, become flat and scaly. Numerous minute glands—glandulae urethrales—open into the urethra. These are most plentiful in the upper, or anterior, wall, but they also occur in smaller numbers in the floor and side walls. They are most numerous in the anterior half of the cavernous portion of the canal, and in the membranous subdivision of the urethra. Dorsal vein Dorsal artery I Dorsal nerve Corpus cavernosum penis c Corpus cavernosum urethra orpus cavernosum penis
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