. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. The Preservation of Species 457 The compact testes of mammals are generally somewhat oval bodies, enclosed in a close-fitting capsular sheath of connective tissue, the tunica albuginea, outside of which, on the free exposed surface at least, is a layer of mesothelium, the visceral layer of the tunica vaginalis, homologous with the peritoneum that lines the body cavity. Underneath the tough tunica albu- Vcjgina Masculina ^ Urethra Appendix Appendix Testis r
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. The Preservation of Species 457 The compact testes of mammals are generally somewhat oval bodies, enclosed in a close-fitting capsular sheath of connective tissue, the tunica albuginea, outside of which, on the free exposed surface at least, is a layer of mesothelium, the visceral layer of the tunica vaginalis, homologous with the peritoneum that lines the body cavity. Underneath the tough tunica albu- Vcjgina Masculina ^ Urethra Appendix Appendix Testis rr/i. Ureter ,'Seminal Vesicle Bulbourethral Gland Tubulus Contortus" Tubulus Rectus — Preputium Ejaculatory Duct Prostate Gland 'Ductus Deferens Paradidymis Ductulus EfTerens Rete Testis Ductulus Aberrans Ductus Epididymidis Fig. 384. Diagram of the male sexual organs. The course of the Miillerian duct is shown by the broken line. The course of the ductus deferens is schematized; in its actual course anteriorly, it runs ventral to the symphysis pubis which would be at the left of the diagram near the base of the penis. (From Bremer and Weatherford, Lewis and Stohr's Histology, copyright 1944, by permission of P. Blakiston's Son and Com- pany, publishers. After Waldeyer.) ginea is another layer of looser texture well supplied with blood vessels, the tunica vasculosa. Partitions of connective tissue extend from the tunica albuginea from one side to the other, dividing the whole testis into wedge- shaped compartments (Fig. 384) within which are lodged the seminiferous tubules that produce the sperm cells (Fig. 385). Two sorts of cells are found within the walls of these tubules; first, the supporting and possibly nutritive. 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. 186
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