File:On the anatomy of vertebrates (electronic resource) (1866) (14750969595).jpg

Identifier: b20416039_003 (find matches)
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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
is situatedimmediately below, or sacrad of,the kidney, ib. a, and is sus-pended to that gland by a foldof peritoneum ; the same fold iscontinued to the neck of thebladder, inclosing the vas de-ferens, fig. 308, a, which appearsto be thick and simple, butwhen injected and dissected, as atf, fig. 502, is seen to be slenderand disposed in a series of closetransverse folds. In neitherOrnithorhynchus nor Ecliidnais there any disparity of size between the right and left testicle.The vas deferens emerges from the upper and inner part ofthe testis e; and, from the peculiar extent of its transverselyfolded disposition, seems to prolong the epididymis nearly to theneck of the bladder; the folds gradually diminish, and the ductitself enlarges, as it approaches its papillary termination, which is inthe beginning of the urogenital canal,//. This canal is continued T T 2 502
Text Appearing After Image:
Male organs, Ornithorhynchus. hxxxi. 644 ANATOMY OF VERTEBRATES. through the pelvis and terminates in the vestibular passage, anteriorto the orifice of the rectum, q. The vascular tissue of the peniscommences at the termination of the urogenital canal; it is sepa-rated by a median septum into two lateral moieties, and both areinclosed by a common dense fibrous sheath. The whole penis inits collapsed and retracted state is about fifteen lines in length inEchidna, and is concealed in a large preputial sheath. The ter-minal half of the penis is formed by the glans, which, in Orni-thorhynchus, presents a quadrilateral form, /, and is traversed by amedian longitudinal furrow upon both the upper and the undersurface. Its exterior is beset with numerous short and hardepidermal spines : its extremity is bifurcate, and each lobe isdirected outward, and terminates in three or four spines, ib. k, It,much larger, but softer, than the rest, and which are usually re-tracted in a depression. A longi

Note About Images