. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 36 THE TESTIS AND ITS RELATION TO REPRODUCTION finement the seminiferous tubules experience marked degenerative changes and only Sertoli cells remain (fig. 19A, B). The interstitial tissue, however, is not greatly impaired. If such a testis is kept not too long within the abnormal position and once again is returned to the scrotum, spermatogenesis is reju- venated (fig. 20A, B). In a second experiment, the scrotum of a ram was encased loosely with
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 36 THE TESTIS AND ITS RELATION TO REPRODUCTION finement the seminiferous tubules experience marked degenerative changes and only Sertoli cells remain (fig. 19A, B). The interstitial tissue, however, is not greatly impaired. If such a testis is kept not too long within the abnormal position and once again is returned to the scrotum, spermatogenesis is reju- venated (fig. 20A, B). In a second experiment, the scrotum of a ram was encased loosely with insulating material; a rapid degeneration of the seminif- erous tubules followed. Young ('27, '29) in a third type of experiment found that water 6 to 7°warmer than the body temperature applied to the external aspect of the guinea-pig testis for a 15-minute period evoked degenerative. 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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