. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Tunica *J&?m Vaginalis. —Scrotum Processus Vaginalis' Fig. 386. Three stages in the descent of the testes. (After Patten.) The testes lie within a cavity in the scrotum which is homologous with the body cavity of which it was originally a part. As a result of this peculiar development there is a double layer of enwrapping peritoneum, or tunica vaginalis, about the testes, one the parietal layer lining the scrotal coelom itself, and the other the viscer
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Tunica *J&?m Vaginalis. —Scrotum Processus Vaginalis' Fig. 386. Three stages in the descent of the testes. (After Patten.) The testes lie within a cavity in the scrotum which is homologous with the body cavity of which it was originally a part. As a result of this peculiar development there is a double layer of enwrapping peritoneum, or tunica vaginalis, about the testes, one the parietal layer lining the scrotal coelom itself, and the other the visceral layer which is reflected over the surface of the testes in close contact with the tunica albuginea, as already mentioned. The inguinal canal, a continuous passage-way between the abdominal cavity and the scrotal sac, remains open in those mammals subject to a temporary descent of the testes. It is always pervious also in marsupials, although in other mammals having a permanent descent it ordinarily becomes closed. Through it runs the spermatic cord composed of arteries, veins, lymphatics, and nerves in addition to the ductus deferens itself. As in the case of all abdominal organs, the testis and these structures in the inguinal canal are all extra-coelomic, , outside the coelom. The wall of the scrotum is essentially the same as the neighboring body. 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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Keywords: ., bookcentury1900, booksubjectanatomycomparative, booksubjectverte
