. Surgery, its principles and practice . thesame relation to each other, the prostates always entering lowest, and oneither side of the middle line. The prostates in animals vary from merececal diverticula, as in the guinea-pig, to a complicated racemose glandularstructure similar to those in man. Richardson thinks that the prostategland, seminal vesicles, and Cowpers glands have the same function inanimals, viz., to provide a medium in which the spermatozoa can live. Thecomparative size of these accessory glands varies very greatly in differentanimals. In some the seminal vesicles are of huge
. Surgery, its principles and practice . thesame relation to each other, the prostates always entering lowest, and oneither side of the middle line. The prostates in animals vary from merececal diverticula, as in the guinea-pig, to a complicated racemose glandularstructure similar to those in man. Richardson thinks that the prostategland, seminal vesicles, and Cowpers glands have the same function inanimals, viz., to provide a medium in which the spermatozoa can live. Thecomparative size of these accessory glands varies very greatly in differentanimals. In some the seminal vesicles are of huge size and the prostateand Cowpers glands insignificant, and in others the opposite is the glands are always, and the prostates almost always present,but the seminal vesicles are often absent and replaced by enlarged vasadeferentia. In animals the prostates are never situated close to thebladder, as in man, but are appendages of the urethra, and in no wayconnected with the bladder. The utricle opens posteriorly in the median. c Fig. -Anteroposterior Section of True Pelvis inTHE Male (Proust)A, Central tendon; B, space between bulb and rec-tum; C, recto-urethralis muscle; D, posterior layer ofaponeurosis of Denonvilliers; E, space between the twolayers of aponeurosis of Denonvilliers. ANATOMY. 379 line of the urethra and nearest to the bladder of all the accessory each side of the utricle are the orifices of the vasa deferentia. Stilllower down, and at a considerable distance from the bladder, the ducts ofthe prostates open into the urethra on each side posteriorly. The factthat in animals the utricle enters the urethra in an entirely differentlevel than the prostatic ducts shows that the prostate cannot be consideredthe homologue of the female uterus, which arises from the same fetalstructure as the utricle, the Miillerian duct. Histology.—The prostate consists of gland tissue surrounded bystroma which is continuous with the capsule, the urethra, an
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