. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. DEVELOPMENT OF REPRODUCTIVE SYSTEM 801. 2 PROTOPTERUS J W K Q POLYPTERUS 5 AMIft N. J SiLMONID Fig. 351—(Continued) See legend on pp. 798 and 799. 35IC). The blind caudal end of the invagination grows posteriorly along the side of the mesonephric duct to join the cloaca (fig. 351C-2). a. Male Reproductive Duct The developing gonad of the males of Amphibia, reptiles, birds, and mam- mals, together with the elasmobranch and ganoid fishes, appropriat
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. DEVELOPMENT OF REPRODUCTIVE SYSTEM 801. 2 PROTOPTERUS J W K Q POLYPTERUS 5 AMIft N. J SiLMONID Fig. 351—(Continued) See legend on pp. 798 and 799. 35IC). The blind caudal end of the invagination grows posteriorly along the side of the mesonephric duct to join the cloaca (fig. 351C-2). a. Male Reproductive Duct The developing gonad of the males of Amphibia, reptiles, birds, and mam- mals, together with the elasmobranch and ganoid fishes, appropriates the mesonephric duct for genital purposes. In this appropriation, the rete tubules of the testis unite with certain of the mesonephric tubules. The latter form the vasa efFerentia or efferent ductules of the epididymis (fig. 351A-C). In teleosts, dipnoan fishes, and Polypterus, the marginal testicular duct becomes modified into a vas deferens which conveys the genital products to the uro- genital sinus (fig. 351F-H). In all vertebrates and in some mammals (Chap. 1), the testis remains within the abdominal cavity. However, in most mammals and in the flatfishes, there is a posterior descent of the testis (figs. 3 and 5) into a compartment posterior to the abdominal cavity Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nelsen, Olin E. (Olin Everett), b. 1898. New York, Blakiston
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