. The science and art of midwifery. Fig. 28.—Uterus semi-partitus. (Gravel.) DEVELOPMENT OF THE OVUM. 35 PHYSIOLOGY OF THE OVUM, CHAPTER II. DEVELOPMENT OF THE OVUM. The Graafian follicles and the ovum.—Discharge of the ova from the ovary, and theformation of the corpus luteum.—The migration of the ovum.—Fecundation.—Changes taking place in the ovum subsequent to fecundation.—Nourishment of theembryo.—The allantois and chorion.—The deciduae.—The placenta; its developmentand structure.—Formation of the umbilical cord.—The amniotic fluid. The physiology of the ovum comprises its genesis, develop
. The science and art of midwifery. Fig. 28.—Uterus semi-partitus. (Gravel.) DEVELOPMENT OF THE OVUM. 35 PHYSIOLOGY OF THE OVUM, CHAPTER II. DEVELOPMENT OF THE OVUM. The Graafian follicles and the ovum.—Discharge of the ova from the ovary, and theformation of the corpus luteum.—The migration of the ovum.—Fecundation.—Changes taking place in the ovum subsequent to fecundation.—Nourishment of theembryo.—The allantois and chorion.—The deciduae.—The placenta; its developmentand structure.—Formation of the umbilical cord.—The amniotic fluid. The physiology of the ovum comprises its genesis, development,and discharge from the ovary, its fecundation, and the entire seriesof subsequent changes by which the simple structure of the germbecomes converted into a complex organism presenting the specificcharacteristics of the parent. • -WMlhi WK Wi^lMM CM \. 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
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