. The science and art of midwifery . germinal vesicle (nucleus) andgerminal spol (nucleolus); KE. germinalepithelium; Lf. liquor folliculi; Mg. mem-brana or tuuica granulosa, or follicular epi-thelium : Mi>. zona pellucida ; PS, ingrowthsfrom the germinal epithelium, ovarian tubes,by means of which some of the nests retaintheir connection with the epithelium ; 8,cavity which appears within the Graafian follicle ; fib, stroma of ovary ; TJ\ theca fol-liculi or capsule; I, primitive ova. Whenan ovum with its surrounding cells has be-come Beparated from the nest, it is known asa Graafian folli
. The science and art of midwifery . germinal vesicle (nucleus) andgerminal spol (nucleolus); KE. germinalepithelium; Lf. liquor folliculi; Mg. mem-brana or tuuica granulosa, or follicular epi-thelium : Mi>. zona pellucida ; PS, ingrowthsfrom the germinal epithelium, ovarian tubes,by means of which some of the nests retaintheir connection with the epithelium ; 8,cavity which appears within the Graafian follicle ; fib, stroma of ovary ; TJ\ theca fol-liculi or capsule; I, primitive ova. Whenan ovum with its surrounding cells has be-come Beparated from the nest, it is known asa Graafian follicle. DEVELOPMKNT OF THE OVUM. 37 drical cells. Gradually new layers form, in which the ovum lies im-bedded. Afterward, at a point remote from the ovum, a crescent-shaped opening makes its appearance, which becomes idled with a clearfluid derived from transuded serum, and in part from liquefied epithe-lium. A heap of cells remains about the ovum and forms the discusprdligerus. With the increase of the follicular fluid the cylindrical. Fig. 80.—Sagittal section of the ovary of an adult bitch (after Waldeyer). o. e, ovarian epi-thelium : o. t. ovarian tubes; //./. younger follicles; , older follicle; , discus pro-li^erus, with the ovum ; e, epithelium of a second ovum in the same follicle : /. r. fibrouscoat of the follicle ; p. r, proper coat of the follicle; e. /, epithelium of the follicle (mem- brana granulosa); <.the parovarium, divided longitudinally and transversely blood-vessels : c. t% cell-tubes of t. c, beginning of the ovarian epithelium,close to the lower border of the ovary. cells are pressed against the membrana propria, and form a third coat-ing, or layer, termed the membrana granulosa. A glance at a transverse section through the ovary of a mature mam-mal exhibits follicles of different ages. To recapitulate : PHYSIOLOGY OF THE OVUM, The young follicle
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