. Cunningham's Text-book of anatomy. Anatomy. Urethra. Lateral asjiect of prostate Infero-lateral area of bladder •Urethra Fig. 1013.—The Urinary Bladder, Prostate, and Seminal Vesicle viewed from the side. Drawn from specimens hardened in situ. In A the bladder contained but a small amount of fluid ; in B the quantity was somewhat greater. Structure of the Ductus Deferens and of the Vesicula Seminalis.— Except near its termination, where it is dilated to form the ampulla, the ductus deferens is a thick-walled tube with relatively a very small lumen. The hard cord-like sensation which the duct
. Cunningham's Text-book of anatomy. Anatomy. Urethra. Lateral asjiect of prostate Infero-lateral area of bladder •Urethra Fig. 1013.—The Urinary Bladder, Prostate, and Seminal Vesicle viewed from the side. Drawn from specimens hardened in situ. In A the bladder contained but a small amount of fluid ; in B the quantity was somewhat greater. Structure of the Ductus Deferens and of the Vesicula Seminalis.— Except near its termination, where it is dilated to form the ampulla, the ductus deferens is a thick-walled tube with relatively a very small lumen. The hard cord-like sensation which the ductus deferens conveys to the touch is due to the thickness and toughness of its wall, which is composed of three layers—an outer fibrous tunica adventitia, an inter- mediate tunica muscularis, and an inner tunica mucosa. The thickness of the wall is due to the great development of the middle or muscular coat, which is composed of an intermediate layer of circularly and an inner and outer layer of longitudinally directed unstriped muscular fibres. Of these layers the middle one is by far the thickest, and forms the chief part of the thickness of the wall of the ductus deferens. The mucous membrane of the duct exhibits a number of slight longitudinal folds and possesses a ciliated epithelium. The ampulla, or terminal part, possesses a much thinner wall, and, as the surface of its mucous membrane has a number of ridges separating depressed areas, the lining of this part of the tube presents a pitted or honeycombed appearance. The wall of the vesicula seminalis resembles that of the ampulla in being thin, and in having a mucous lining with uneven honeycomb-like ridges and depressions. In it the same coats are to be recognised as in the ductus deferens, but the muscular layer is much thinner, and the strata composing it less regularly arranged. The seminal vesicles are not present in all mammals, and in those in which they do occur their relative size and form vary much. Among
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