Physiology : a manual for students and practitioners . Human Ovum, rui)fured byPressure, showing tlie vitelluspartially expelled, the gernii-native vesicle, with its germi-uative spot, at a, and thesmooth fracture of the vitel-line Section of the Ovary (after Schron): 1, outer covering; 1, attached border; 2, centralstroma; 3, peripheral stroma; 4, blood-vessels ; 5, Graafian follicles in their earlieststa^e ; 6, 7, 8, more advanced follicles ; !), an almost mature follicle ; 9, follicle fromwhich the ovum has esciped ; 10, corpus luteum. Whence is the ovum derived? It is a very hig
Physiology : a manual for students and practitioners . Human Ovum, rui)fured byPressure, showing tlie vitelluspartially expelled, the gernii-native vesicle, with its germi-uative spot, at a, and thesmooth fracture of the vitel-line Section of the Ovary (after Schron): 1, outer covering; 1, attached border; 2, centralstroma; 3, peripheral stroma; 4, blood-vessels ; 5, Graafian follicles in their earlieststa^e ; 6, 7, 8, more advanced follicles ; !), an almost mature follicle ; 9, follicle fromwhich the ovum has esciped ; 10, corpus luteum. Whence is the ovum derived? It is a very highly developed cell, wliich is derived from thegerminal epithelium covering the ovary. In the development ofthe ovary this epithelium dips into the surface of the organ, and a 176 EMBRYOLOGY. certain portion is finally walled off by growth of the surface a ball of epithelial cells is introduced into the body of theorgan, and one cell develops the ovum, the rest going on to makeup the Graafian follicle and the trerm-hill. (See 5, 6, 7, 8, 9,Fig. 53.) Describe the ovum. It is a minute globular cell containing a nucleus and diameter it is a little less than y^g in. (Fig. 54). Fig. 54.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiology, bookyear1
