File:Image from page 667 of "On the anatomy of vertebrates (electronic resource)" (1866) (14750973035).jpg

Identifier: b20416039_003 Title: On the anatomy of vertebrates [electronic resource] Year: 1866 (1860s) Authors: Owen, Richard, 1804-1892 Subjects: Anatomy, Comparative Vertebrates Fishes Reptiles Mammals Birds Publisher: London : Longmans, Green Contributing Library: Wellcome Library Digitizing Sponsor: Wellcome Library

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Text Appearing Before Image: e of the bladder. The vesi-Gians penis of the cular glands present a white and glistening ex-terior ; they are of an elongated form, with thinparietes, and send off, on one side principally, from fifteen totwenty obtuse crecal processes. The prostate gland consists offour principal masses or lobes, each composed of a number offlattened tubular cseca, with thin and easily lacerable parietes,compacted together by cellular tissue. The muscular part of theurethra is closely embraced by a thick stratum of muscular fibres,diverging in a double oblique or penniform manner from a middlelongitudinal inferior raphe: the acceleratores urinae have theusual relations to a large bulb of the urethra: the crura penisare embraced by short but strong e erectores ; the (levatoresmuscles, or compressores venaa dorsalis, terminate in a singletendon, passing along the dorsum penis, to be inserted into anelongated flattened ossicle in the glans, which, in this genus, is1 xx. vol. iv. p. 75, Nos. 2495, 2496.

Text Appearing After Image: MALE ORGANS OF RODENTS. 653 which gives it so remarkable unprovided with the horny armaturea character in the Cavies. In the Beaver {Castor canadensis) I have usually found thetestes, fig, 508, r, s, though small in proportion to the bulk ofthe animal, lodged in subcutaneous depressions between thecastor-bags; but with the usual wide opening of the < tunicavaginalis, permitting easy re-turn of the gland into theabdomen. The tortuous dis-position of the vasa deferentiawould favour such periodicalmovements of the testes: theterminal portion of the ducts,fig. 508, a, is dilated, or en-larged by glandular thickeningof the walls, the inner surfaceof which is multiplicate. Thevesicular glands are (for Ro-dents) moderate sized convo-luted bags, fig. 508, o, p : theduct, fig. 509, d, sometimescommunicates with, sometimesterminates distinctly from, thecontiguous vas deferens, ib. a.The prostatic glands, ib. c, c,are a cluster of shorter pyri-form sacs, the long slenderducts of which interco

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