. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 252 TEXT-BOOK OF EMBRYOLOGY. The question of the origin of the follicular cells is still an unsettled one, though it seems probable that they are derived from the cells of the egg-columns, and Minot believes that they are probably descended from the primitive ova. The formation of new Graafian follicles, and consequently of ova, begins in the deeper part of the ovary and advances toward the surface. The production of ova and follicles is. Fig. 129.—Section of human ovary, including cortex : a, g
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 252 TEXT-BOOK OF EMBRYOLOGY. The question of the origin of the follicular cells is still an unsettled one, though it seems probable that they are derived from the cells of the egg-columns, and Minot believes that they are probably descended from the primitive ova. The formation of new Graafian follicles, and consequently of ova, begins in the deeper part of the ovary and advances toward the surface. The production of ova and follicles is. Fig. 129.—Section of human ovary, including cortex : a, germinal epithelium of free surface; b, tunica albuginea; c, peripheral stroma containing immature Graafian follicles (d); e, well-advanced follicle from whose wall membrana granu- losa has partially separated ; /, cavity of liquor folliculi; g, ovum surrounded by cell-mass constituting discus proligerus (Piersol). limited to the fetal stage and to the early part of post-natal life, their formation not occurring, according to Waldeyer, after the second year. What has been said above refers to the development of the cortex of the ovary. The medulla is produced by the growth toward the egg-columns of cord-like processes, the medullary cords, from the epithelial walls of the Malpighian corpuscles of the primitive kidney or Wolffian body, the cords becoming surrounded by connective tissue and forming a network. The fetal medullary cords are represented in both the cortex and the medulla of the mature ovary by the groups of interstitial cells disposed between the bundles of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Heisler, John Clement; Waterstone, David, former owner; Duke-Elder, Stewart, 1898-1978, former owner; University College, London. Library Services. Philadelphia : W. B. Saund
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