. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EFFECTS OF X-RAYS ON MOUSE TESTIS 233 Nuclei were recorded as belonging to the following classes: interphasic sper- matogonia, dividing spermatogonia, spermatocytes, spermatids, sperm and Sertoli nuclei. Eschenbrenner et al. did not record "hits" on Sertoli nuclei and recorded only spermatids possessing spherical nuclei and only those sperm heads evincing "well defined dorsal ; In the present work, all stages of spermatid develop- ment and of sperm maturations were recorded. On account of these diffe
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EFFECTS OF X-RAYS ON MOUSE TESTIS 233 Nuclei were recorded as belonging to the following classes: interphasic sper- matogonia, dividing spermatogonia, spermatocytes, spermatids, sperm and Sertoli nuclei. Eschenbrenner et al. did not record "hits" on Sertoli nuclei and recorded only spermatids possessing spherical nuclei and only those sperm heads evincing "well defined dorsal ; In the present work, all stages of spermatid develop- ment and of sperm maturations were recorded. On account of these differences in procedure, the results of Eschenbrenner ct al. and those reported here are not strictly comparable. RESULTS A. Histological studies The histological scoring data are summarized in Table I and are presented in graph form in Figures 1-4. In Table I the data pertaining to both strains are 200- c!'50 SPERMATOGONIA-INTERPHASE O—O SPERMATOGONIA-MITOTIC A—A SPERMATOCYTES. 10 FIGURE 3. 5 10 DAYS AFTER X-RAYS (320r) Strain S. Incidence of spermatogonia and spermatocytes at different times following 320 r of x-rays. presented together in order to facilitate their comparison. All values in this table are expressed in terms of per cent of control values. These data indicate that with the exception of the dividing spermatogonia, there is no pronounced change in the cellular composition of the seminiferous epithelium during the first 24 hours following irradiation. During the period of 1-3 days after irradiation there occurs a marked decline in the area occupied by interphasic sper- matogonia. Some regeneration of spermatogonia is apparent by 10 days and is well underway by 16 days. Dividing spermatogonia, on the other hand, undergo a rapid decrease during the period of 1-8 hours after irradiation. At 24 hours,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustra
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