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Title: Comparative anatomy of vertebrates Identifier: comparativeanato00wied Year: 1907 (1900s) Authors: Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923 Subjects: Anatomy, Comparative; Vertebrates Publisher: London, Macmillan and co. , limited Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library


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Text Appearing Before Image: 484 COMPARATIVE ANATOMY From this point to its termination at the apex of the penis, the seminal canal is spoken of as the ductus cjaculatorius. In many Mammals vestiges of the Miillerian ducts are pre- sent in the male, and open into the urinogenital sinus. In Man, only the posterior end of the ducts remain in the form of an unpaired vesicle (uterus maculinus), which lies embedded within an accessory genital gland, the prostate. Accessory genital glands (Fig. 364), certain of which have just been referred to, are present in all Mammals, but vary much in ves.v.d. gl.prost I— (il.prost III

Text Appearing After Image: 3i— gl.aillp -ves.ur _. gl.cou-p c.c.p — « re tli. 1 -yl.prctp g.p. FIG. 364.—URINOOENITAL CANAL AND ACCESSORY GENITAL GLANDS OF A MALE MOUSE (Mm musculus) x 2. (After M. Rauther.) c.c.p, corpus cavernosum of the penis ; yl.amp, ampullary glands: gl.cowp, bulbo- urethral (Cowper's) glands ; y.p, apex of penis, seen through a slit made in the prepuce ; yl.prcep, prseputial gland ; gl.prott /, prost III, prostate—the posterior and dorsal portion is hidden ; ur, ureter ; v.d, vas deferens ; ves.ur, urinary bladder ; ureth, urethra ; ves.v.d, vesiculre seminales. number, form, and relative size. They may be classified as follows :— I. Glands arising from the seminal duct. A. Ampullary glands, situated in an ampulla-like enlargement of the seminal duct or embedded in the latter: they are present, e.g., in the Shrew, Ruminants, and certain Carnivores and Rodents ; in many of the


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