. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 142 THE DEVELOPMENT OF THE GAMETES OR SEX CELLS. CYTOPLASMIC MEMBRANE ACR OSOME VACUOLE NUCLEUS POS T- UCLEAR CAP ECK GRANULE T E R 10 R CE NT RIOLE MEMBRANE OCHONDRIAL SHEATH TER10 R OR CE NTRIOLE L FILAMENT F TAIL Fig. 77. Spatula-type sperm of various mammals. (Compiled from Bowen; Gatenby and Beams; Gatenby and Woodger; see references in bibliography.) Observe the vacuole inside the head of the sperm. Gatenby and Beams found that this vacuole,
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 142 THE DEVELOPMENT OF THE GAMETES OR SEX CELLS. CYTOPLASMIC MEMBRANE ACR OSOME VACUOLE NUCLEUS POS T- UCLEAR CAP ECK GRANULE T E R 10 R CE NT RIOLE MEMBRANE OCHONDRIAL SHEATH TER10 R OR CE NTRIOLE L FILAMENT F TAIL Fig. 77. Spatula-type sperm of various mammals. (Compiled from Bowen; Gatenby and Beams; Gatenby and Woodger; see references in bibliography.) Observe the vacuole inside the head of the sperm. Gatenby and Beams found that this vacuole, in some instances, stains similar to a nucleolus, but suggest it may be a hydrostatic organ, or respiratory structure. (P. 20, Quart. J. Micr. Sc, 78.) suggest their description as "lamp-brush" chromosomes. Another difference of chromatic behavior is manifested by the fact that the chromosomes in the developing female gamete during the diplotene stage are not easily stained by the ordinary nuclear stains, whereas the chromosomes in the spermatocyte stain readily. Aside from the differences in chromosomal behavior, great discrepancies in the amount of growth of the nucleus occur in the two gametes during meiosis. The nucleus of the oocyte greatly increases in size and a large quantity of nuclear fluid or sap comes to surround the chromosomes (figs. 7IF, G; 72C, F, E). Correlated with this increase in nuclear size, the egg grows rapidly,. 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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