Embryology : from Quain's anatomy, ninth edition.

  • Jones Quain
Date:
1882
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Licence: Public Domain Mark

Credit: Embryology : from Quain's anatomy, ninth edition. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    prominence on the mesial side of the Wolffian body. The farther development of the glandular part of the organ consists mainly in the formation of ovigerms and ova, and the enclosure of these in Graafian follicles by a peculiar combination or intermixture of the germinal cells from the surface with the deeper blastema which forms the stroma of the organ. Fig. S06. Fig. 806.—Transverse section through the ovary of an embryo shark, showing THE GERM-EPITHELIUM PASSING INTO PRIMITIVE OVA (from Balfour). At ]io, the prismatic germ-epithelium and two primitive ova of which one is still on the surface, the other has sunk below the epithelium ; elsewhere the lightly-shaded part of the figure shows the ovarian stroma or lymphatic tissue and the covering of ordinary epithelium. Primordial Ova.—From the researches of Waldeyer (No. 58) and of many others there cannot now be any doubt that the primitive ova o, the ovary full of primordial ova ; e, tubes of the upper part of the Wolffian body forming the cpooplioron (parovarium of Kobelt); W, the lower part of the Wolffian body forming the paroophoron of His and Waldeyer ; io\ the Wolffian duct; M, the Mullerian duct; in', its upper fimbriated opening. arc derived from some of the cells of the germ-epithelium which undergo enlarge- ment and subsequently become enclosed in Graafian follicles. But doubts have existed as to the exact manner in which this enclosure takes place, and more es- pecially as to the source of the cellular lining of the follicle which is allied to epithelium and gives rise to the so-called granular membrane of later periods. According to the view first advocated by Waldeyer, the cells Fig. 807. Fig. 807.—Internal organs of a female human F0BTUS OF aft INCHES LONG, OR ABOUT 14 WEEKS. Magnified (from Waldeyer).