Elements of comparative anatomy (1878) Elements of comparative anatomy elementsofcompar00gege Year: 1878 612 COMPARATIVE ANATOMY. The generative apparatus of the Amphibia is very similar to that of the Selachii. The ovaries (Fig. 348, A, ov) form lamelke, which project into the abdominal cavity, and vary in size according to the number of the eggs which are being developed. In the Urodela they enclose a cavity, which is broken up into several spaces in the Anura. The Mullerian duct forms the oviduct (od), which com- mences a long way anteriorly, by an infundibular orifice, and which always op
Elements of comparative anatomy (1878) Elements of comparative anatomy elementsofcompar00gege Year: 1878 612 COMPARATIVE ANATOMY. The generative apparatus of the Amphibia is very similar to that of the Selachii. The ovaries (Fig. 348, A, ov) form lamelke, which project into the abdominal cavity, and vary in size according to the number of the eggs which are being developed. In the Urodela they enclose a cavity, which is broken up into several spaces in the Anura. The Mullerian duct forms the oviduct (od), which com- mences a long way anteriorly, by an infundibular orifice, and which always opens separately into the cloaca. It is generally greatly increased in size at the breeding season; this results in its being thrown into a number of coils. In the oviparous species (Salamandra) the terminal por- tion of the oviduct functions as a uterus. The testes are placed in the same region as the ovaries. They either form a compact organ, or consist of a series of larger or smaller (and consequently more numerous) bodies. The latter is the case in many Ccecilias, while in others there are intermediate stages towards the more compact form. A longitudinal collecting duct receives the efferent ducts of the different portions of the testis, and gives off again trans- verse canals, which correspond in number to the primary divi- sions of the kidney and are con- nected with them. The kidney, therefore, is the efferent duct for the sperm, which is passed out through the ureter (secondary arehiuephric duct). In the Anura, the sperm from the testis is passed to the kidney by a net- work of fine canals which are The canals, however, which pass into the kidneys from the longitudinal collecting duct, traverse the kidneys, without being connected with the Malpighian corpuscles, and open directly into the ureter. Bufo is the sole exception; in it there is a connection between the vasa efferentia and the Malpighian corpuscles. In tho Urodela the anterior portion of the kidney (genital por
Size: 941px × 2126px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
