A textbook of obstetrics . Si ifp K Fig- 53-—Section through part of amammalian ovary : KE, Germinal epitheli-um ; PS, an egg-cord ; i\ U, primitive ova ;G, investing cells; A*, germinal vesicle ;S, follicular cavity arising in one of theolder follicles ; Lf, follicular cavity, moreenlarged ; AY, nearly mature ovum, whichhas developed around it the zona pellu-cida, Mp; Mg, membrana granulosa; E>,Discus proligerus; So, ovarian stroma;Tf, capsule of follicle ; g,g, blood-vessels;u, immature Graafian follicle (after Wie-dersheim). OVULATION. 61 The Discharge of the Ovum from the Ovary and its
A textbook of obstetrics . Si ifp K Fig- 53-—Section through part of amammalian ovary : KE, Germinal epitheli-um ; PS, an egg-cord ; i\ U, primitive ova ;G, investing cells; A*, germinal vesicle ;S, follicular cavity arising in one of theolder follicles ; Lf, follicular cavity, moreenlarged ; AY, nearly mature ovum, whichhas developed around it the zona pellu-cida, Mp; Mg, membrana granulosa; E>,Discus proligerus; So, ovarian stroma;Tf, capsule of follicle ; g,g, blood-vessels;u, immature Graafian follicle (after Wie-dersheim). OVULATION. 61 The Discharge of the Ovum from the Ovary and its Migra=tion to the Uterine Cavity.—Ova are discharged from the ovaryfrom puberty until the menopause,—that is to say, on the average,from the fourteenth to the forty-fifth year. Ovulation, however,. Fig. 54.—Formation of polar bodies in ova of Asterias glacialis: ps, Polarspinale ; pbf, first polar body; pb,f> second polar body; », nucleus returning tocondition of rest (Hertwig). may begin before menstruation, may cease before the menopause,or possibly may continue after it. A young girl has been im-pregnated as early as the ninth year. In the child-marriages of
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
