The Origin of Ova in the Adult Opossum Page: 16
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18
the germinal opitblium. Iaiae and Bartman (125) explain
that the presence of anovular follicles in the oposs ovary
is due to an inrowth of epithbalial ells which fail to be-
Ceoe associated with old ova already present.14 I cannot
justify the claim that ova cannot be produced anew in the
adult and that the germinal opithelia can only Corn fol
lioles or interstitial cells.
Hargitt (1930) ave two methods by which new ova are
produced in the adult rat. First, by enlargement of cells
in the germinal opitholium which become surrounded by aller
neighboring cells, and the group then moving into the tunica
albuganea, forming a young follicle. Second, a nuber of
germinal epithelial cells round into a mass, and without on
largement the entire group moves into the albuginea, where
one of the cells may enlarge to form an ovum, whereas, the
others remain small and form follicel oellsL The first
method similar to that which I have described in the opos-
ae, but I find no evidence of ova formation by the second
method which Bargitt has described. This observation con
forms to the results obtained by Gutherie and Jefters (1938)
frcm their work On adult bat ovaries. Their studies indicate
that oocytes are formed during sexual maturity by the move-
ment of enlarged cells from the germinal epitheliwm into the
1losie League and Carl G. Hartman, "Anovular Graflan
Pollicles in Nenlian O ari es, aat. Re., XXX (125), 1-14.
1kgitt, j, . g, pp. 453-469.
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Everett, Newton Bennie. The Origin of Ova in the Adult Opossum, thesis, August 1938; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc29912/m1/20/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .