File:On the anatomy of vertebrates (electronic resource) (1866) (14564328189).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:
he acceleratorfibres, g ; but degenerates into little more thana close venous plexus as it penetrates, in thePorpoise, the corpus cavernosum; it thenemerges and extends along the under part ofthe corpus cavernosum, to re-expand into thevenous plexus surrounding the tuberous basisof the glans. The upper part, or dorsum, of the cavernous bodyis grooved for the lodgment ofthe plexiform vena dorsalis. Inthe unexcited state the penisis withdrawn and concealed inthe long prepuce, the orifice ofwhich is considerably in ad-vance of the vent. The retrac-tion is effected by a pair ofmuscles, m, arising from theaponeurotic commissure ante-rior to the sphincter ani e, andrunning along the under orurethral side of the penis tobe inserted into the sclerousbasis of the glans. The pro-trusion of the organ is aidedby the transverse fibres of thee panniculus carnosus sur-rounding the preputial sheath.The section of the penis ofa Balcenoptera preserved byHunter shows a single corpus cavernosum u u 2 518
Text Appearing After Image:
Male organs, Phoccena. grooved above for the 6G0 ANATOMY OF VERTEBRATES. vena dorsalis, and more deeply excavated below for the corpusspongiosum urethras.1 § 375. In Sire)da.—These mutilate Mammals are also 4 testi-conda, but differ from the Cetacea in having vesicular glands, apenis with a septum corporis eavernosi, and provided with apair of levatores, which unite to form a tendon upon the6 dorsum. In the Dugong (Ha lie ore), the glans consists of twosemilunar side-lobes, including the conical process, on the apexof which the urethra opens. In a half-grown male the vesicularglands were four inches long and two inches across the fundus,where their glandular parietes were thickest; the internal sur-face was reticulate. The vasa deferentia were irregularly con-voluted : they communicated with the duct of the vesiculargland, the common opening being into the dilated beginning ofthe urethra, which describes a curve below the vesical orifice:according to Louckart, it receives the openi

Note About Images