. The science and art of midwifery. Fig. 29.—Section of Wolffian body, with rudimentary ovarv (embryo of chick, fourth day ofincubation). WK. Wolffian body ; y, section of Wolffian duct; a, a, thickened epithe-lium ; 2, duct of Muller; E, early stage in development of ovary ; 0, 0, primordialova ; m, mesentery ; Z, lateral wall of abdomen. (Waldeyer.) The following account of the history of the ovum is derived fromWaldeyers now tolerably familiar work.* The Graafian Follicles and the Ovum.—In the embryo * Eierstock und Nebeneicrstock, Strickers Handbuch der Lehre von den Gewe-ben, Leipsic, 18*
. The science and art of midwifery. Fig. 29.—Section of Wolffian body, with rudimentary ovarv (embryo of chick, fourth day ofincubation). WK. Wolffian body ; y, section of Wolffian duct; a, a, thickened epithe-lium ; 2, duct of Muller; E, early stage in development of ovary ; 0, 0, primordialova ; m, mesentery ; Z, lateral wall of abdomen. (Waldeyer.) The following account of the history of the ovum is derived fromWaldeyers now tolerably familiar work.* The Graafian Follicles and the Ovum.—In the embryo * Eierstock und Nebeneicrstock, Strickers Handbuch der Lehre von den Gewe-ben, Leipsic, 18*71; Eierstock und Ei, Lcipsic, 1870. 36 PHYSIOLOGY OF TEE OVUM. of the chick, by the fourth day of incubation, the Wolffian bodyis covered by cylindrical epithelium, contrasting sharply with theflattened cells of the peritonaeum. Soon after, a thickening of the. Fig. 30.—Vertical section of an ovary of a human foetus thirty-two weeks old. a, a, epithe-lium; b, b} latest developed epithelial cells, situated in the epithelial layer; c, trabeculeof connective tissue which have penetrated into the epithelial layer ; e, e, primordial fol-licles surrounded by fine connective-tissue cells ;,/, groups of imbedded epithelial cells,among which may be distinguished certain ones of large size (primordial ova); y, granu-lar cells of His. (Waldeyer.) epithelium becomes noticeable on the inner side, and forms theearliest trace of the ovary. Next, a small rounded elevation, rich incells, and derived from the interstitial tissue of the Wolffian body,makes its appearance underneath the thickened epithelium. The epi-thelium is destined to form the Graafian follicles and ova; the pro-liferated connective tissue furnishes the vascular stroma of the the fourth and fifth day, certain cells already indicate theirdestiny as future ova, by their size,
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Keywords: ., bookcentury1800, bookdecade1890, bookidsci, booksubjectobstetrics
