_Graafian follicle._—The ovum surrounded by the follicular epithelium is called the Graafian follicle. The ripe Graafian follicles lie usually near the periphery of the ovary. The Graafian follicle is bubble-shaped and is surrounded by a fibrous sheath, the theca folliculi. The cavity contains a light yellow fluid, liquor folliculi. The interior of the cavity is coated with several layers of follicular epithelia. This coat is called the membrana granulosa. The follicular epithelia form at one point a disc of cells, the discus oophorus, which includes in its midst the ovum. [Illustration: CUT XXIV. _Graafian follicle, found by the author in a woman of forty, operated for cancer of the uterus._ vg, vesicula germinativa; mg, macula germinativa; o, ovum; zp, zona pellucida; cr, corona radiata; l, liquor in a coagulated state; a, antrum folliculi; t, theca folliculi.] _Ovum._—The ovum is a modified cell with a membrane, called zona pellucida, a cytoplasm, called vitelus, a nucleus called vesicula germinative, and a nucleolus, called macula germinative. At the time of menstruation the Graafian follicle bursts; the ovum thus freed, is taken up by the current, called forth by the ciliar motion of the tubal epithelia, and brought through the tubes into the uterus. _Nerves and their centres._—The centres of the female genital nerves are, just as in the male, six in number, three cerebral, two spinal and one in the medulla oblongata. There is, in the first place, the centre of voluptas or cupido, or the centre for the sexual instinct; secondly the centre for experiencing libido or pleasure, and thirdly the centre of inhibition, which under certain circumstances, as in fear, disgust, grief, etc., prevents the erection of clitoris, bulbs, and cervix. The inhibitory centre, however, plays a secondary rôle in the female. The two spinal centres are the centres of erection and of ejaculation. [Illustration: CUT XXV. _Schema of a cell._ a, cell membrane; b, cell-body or cytoplasm; c, nucleus.]