. The comparative anatomy of the domesticated animals. Veterinary anatomy. GENERATIVE APPARATUS. granulosa, consisting of round or polygonal granular cells. At the bottom of the ovisac, this epithelium forms a small mass—the cumulus proUgerus (oi germinal eminence), in the centre of which is the ovulum or eo^or of the mammal. The rontejits {liquor folliculi) is a clear yellow fluid, which becomes red on admixture with blood when the vesicle ruptures. The ovulum, or ovum, is a cell about -j^^ of an inch in diameter, enclosed in the discus proUgerus, or cumulus proUgerus. The ovum is invested by
. The comparative anatomy of the domesticated animals. Veterinary anatomy. GENERATIVE APPARATUS. granulosa, consisting of round or polygonal granular cells. At the bottom of the ovisac, this epithelium forms a small mass—the cumulus proUgerus (oi germinal eminence), in the centre of which is the ovulum or eo^or of the mammal. The rontejits {liquor folliculi) is a clear yellow fluid, which becomes red on admixture with blood when the vesicle ruptures. The ovulum, or ovum, is a cell about -j^^ of an inch in diameter, enclosed in the discus proUgerus, or cumulus proUgerus. The ovum is invested by a thick membrane—the zona pellwida {membrana vitellina), formed of cells traversed by radiating canals—the porous canalicuU (ova-tubes); its granular contents are named the viteUus, or ijolk; and its (vesicular nucleated) nucleus, designated the germinal vesicle, or vesicle of Purkinje, and lying at a certain point on the zona pellucida, has in its centre a white patch—the germinal spot, or spot of Wagner. Balbiani has discovered, alongside the germinal vesicle, another, which he has named the embryogenic vesicle. Vessels and nerves.—The thick, flexuous, arterial divisions are given off by • the utero-ovarian artery; they ^'-- ^^^- ramify in the spaces formed by the tunica albuginea, before reaching the proper tissue by entering the hilus. The veins., are of large calibre, and form a very rich network around the gland—the bulb of the ovary; they terminate in the vena cava, near the renal veins. The lym- phatics are very abundant in the medullary substance, and anas- tomose in a network around the follicles before they pass to the sublumbar glands. The nerves emanate from the small mesen- teric plexus. Development.—The ovary of Solipeds is of great size in the foetus, being often nearly as large as in the adult animal. Fig. 530 exhibits the proportion between its volume and that of the uterus in a six months' foetus. It becomes atrophied in aged animals. Functio
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