. The eggs of mammals. Ovum; Embryology -- Mammals; Mammals -- physiology; Ovum. OVARIAN ATRESIA AND PARTHENOGENESIS 43 for follicles indicates that the total number of atretic mature ova reach their maximum in early dioestrus shortly after ovulation. This is doubtless due to the continued formation TABLE V The Degree of Atresia of Ovarian Follicles of the Mouse at Four Stages of the Oestrus Cycle. (From Engle, 19276) Stage OF Cycle Median OF Spindles Average OF Spindles Range OF Atresia Median OF Total Atresia Average OF Total Atresia Range of Total Atresia Corn 16 6-40 59 60 36- 85 LEI
. The eggs of mammals. Ovum; Embryology -- Mammals; Mammals -- physiology; Ovum. OVARIAN ATRESIA AND PARTHENOGENESIS 43 for follicles indicates that the total number of atretic mature ova reach their maximum in early dioestrus shortly after ovulation. This is doubtless due to the continued formation TABLE V The Degree of Atresia of Ovarian Follicles of the Mouse at Four Stages of the Oestrus Cycle. (From Engle, 19276) Stage OF Cycle Median OF Spindles Average OF Spindles Range OF Atresia Median OF Total Atresia Average OF Total Atresia Range of Total Atresia Corn 16 6-40 59 60 36- 85 LEI 26 7-51 71 50-129 LE2 11 5-17 36 29- 63 0 13 12 0-26 39 15- 70 of antrum-containing foUicles at a fairly high rate for a short time after ovulation. We have seen that ovogenesis continues during preg- nancy. Engle's data dem- onstrate that the formation ^. 30 and atresia of full-grown ^^ ova also occurs during preg nancy, for he observed an t.§ appreciable number of c^gio pseudomaturation spindles in ovaries taken during the first 43/2 days of pregnancy. These data are summarized in Table VI and Figure 14. It is notable that both the total amount of atresia and the atresia of mature ova is ATRETIC FOLLICLES. PSEUDO-MATURATION > SPINDLES I ^--'' • \-^ STAGE OF DEVELOPMENT -Fig. 14. Showing the number of , , , i ii • • 1 atretic folhcles and pseudomaturation less throughout this period spindles in the median ovary at four than during the period of stages in early pregnancy in the mouse. 1 i J i J- • (From the American Journal of Anat- least destruction m non- ^^^^y^ pregnant mice. Unfortu- nately, Engle does not give the percentages of atresia during early pregnancy. The presence of cycles of atresia and growth in animals. 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 w
Size: 2616px × 956px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookco, bookpublishernewyorkthemacmillancompany
