. The eggs of mammals. Ovum; Embryology -- Mammals; Mammals -- physiology; Ovum. 52 THE EGGS OF MAMMALS result of pituitary hormone action and the subsequent atresia of the ova containing them occurs because these ova are not Uberated and fertihzed. " Pseudomaturation " spindles have not been reported in hypophysectomized animals although atresia has. It has long been the contention of certain observers of ovarian atresia that the apparent parthenogenetic develop- t^ 'Mm: '»!.. Fig. 19. Atretic ovum from type 3 follicle in the rabbit. Note fragmentation of cytoplasm and chromatin. me
. The eggs of mammals. Ovum; Embryology -- Mammals; Mammals -- physiology; Ovum. 52 THE EGGS OF MAMMALS result of pituitary hormone action and the subsequent atresia of the ova containing them occurs because these ova are not Uberated and fertihzed. " Pseudomaturation " spindles have not been reported in hypophysectomized animals although atresia has. It has long been the contention of certain observers of ovarian atresia that the apparent parthenogenetic develop- t^ 'Mm: '»!.. Fig. 19. Atretic ovum from type 3 follicle in the rabbit. Note fragmentation of cytoplasm and chromatin. ment of ova destined never to be liberated is simply an incident of the process of degeneration and is not in fact true parthenogenesis (Hensen, 1869; Balfour, 1882; Sobotta, 1899; Janosik, 1897; Bonnet, 1899; Rubaschkin, 1906; Ath- ias, 1909; Kingery, 1914; Kirkham, 1916; Stockard and Papanicolou, 1917; Addison, 1917; Long and Evans, 1922; Clark, 1923; Engle, 19276; Kampmeier, 1929). These in- vestigators have observed varied types of fragmentation of. 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 Pincus, Gregory, 1903-1967. New York, The Macmillan Company
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