. On the anatomy of vertebrates [electronic resource] . Male organs Water-vole, cxxn, long: in the Squirrel (fi| 511 the margin thickened an-teriorly : the (tail is ofmoderate length. It is rela-tively shorter to the body inthe Guinea-pig, fig. 514,^:in this figure a portion of atubule of the testis is mag-nified 300 diameters, show-ing the basilemma a, a, itslining (precipitate) of nucle-ate corpuscles andgranules,b : with the developed nu-clei of detached cells, form-ing the spermatozoa, a. § 372. In Insectivora. — The periodical enlargement1 As in birds ; see vol. ii. p. 243, and xx. vol. i
. On the anatomy of vertebrates [electronic resource] . Male organs Water-vole, cxxn, long: in the Squirrel (fi| 511 the margin thickened an-teriorly : the (tail is ofmoderate length. It is rela-tively shorter to the body inthe Guinea-pig, fig. 514,^:in this figure a portion of atubule of the testis is mag-nified 300 diameters, show-ing the basilemma a, a, itslining (precipitate) of nucle-ate corpuscles andgranules,b : with the developed nu-clei of detached cells, form-ing the spermatozoa, a. § 372. In Insectivora. — The periodical enlargement1 As in birds ; see vol. ii. p. 243, and xx. vol. iv. p Male organs, Rat. and 656 ANATOMY OF VERTEBRATES. descent of the testes are better marked, perhaps, in some h 512 tivora than in Rodentia. In December the testes of the Mole lie on each sido of the uri-nary bladder, with the inverted cremastericpouch attached to the great end of the epididy-mis : in March they are protruded into seroussacs, which look like a continuation of theabdominal cavity beneath the base of the prostatic glands, which begin to increasein February, acquire an enormous size andconceal the urinary bladder towards the latterend of March. The Cowperian glands liebeneath the integument above the root of thetail, and send their duct to terminate in theurethral bulb. The penis, bent backwardupon itself, terminates in a very long conicalglans with an ossicle, lodged in a preputialsheath, which projects freely, a short distancebelow the anus. In a Cape-mole ( Chryso-chloris) I found the testes near the kidneys;but the convolute course of the vasa deferen-tia indi
Size: 1756px × 1423px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubject, booksubjectbirds, booksubjectfishes
