Veterinary obstetrics, including the diseases of breeding animals and of the new-born . become materially changed, to cow?X\\w\.^ permanentova. In the process of development the connective tissue stromathrows out a thin layer, the tunica albuginea, parallel to the sur- Maturation of the Graafian Follicle 45 face of the ovary and serving to divide the germinal epitheliuminto a superficial, columnar lajer and a deeper one broken upinto irregular columns or clumps of spherical or polygonal these cell masses \.\\q. perniaiient ova, developed from the prim-itive ova, become much larger, wh
Veterinary obstetrics, including the diseases of breeding animals and of the new-born . become materially changed, to cow?X\\w\.^ permanentova. In the process of development the connective tissue stromathrows out a thin layer, the tunica albuginea, parallel to the sur- Maturation of the Graafian Follicle 45 face of the ovary and serving to divide the germinal epitheliuminto a superficial, columnar lajer and a deeper one broken upinto irregular columns or clumps of spherical or polygonal these cell masses \.\\q. perniaiient ova, developed from the prim-itive ova, become much larger, while the nucleus or germinalvesicle enlarges and its enveloping membrane becomes contents of the nucleus become massed at one point andform a distinct reticulum, in which one or more nodal points en-large to constitute the nucleoli or germinal spots. The neighbor-ing germinal cells become arranged about the ovum in a mannerto completely enclose it in a follicle, which has at first a singlelayer of cells. Later a second layer of cells forms about the ovumwithin the Fig. 6. Section through part of the ovary of an adult section is taken vertical to the surface of the ovary, and showsone fully formed Graafian follicle, and others in various stages ofdevelopment. X 50- GA, Follicle cells surrounding an ovum. GB, outer layer of Graafian follicle, or tunica granulosa. GC, inner layer of Graafian follicle or discus , Cavity of Graafian follicle. OE, Outer layer of columnar epithelial cells, investing the , Ovum. OY, Primitive Ovum. OZ, Nests of Epithelial cells derived from the deeper layers ofthe genital epithelium. ( Marshall.) 46 letcri7iary Obstetrics The cells of the follicle inultipl} rapidly and, the growth of theexternal layer being more rapid than the inner, there results aseparation between the two, except at the point of attachment ofthe ovum, revealing upon section, a cresent-shaped cavity which isfilled with fluid. Fully
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectveterinaryobstetrics
