. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. OVARY — (FUNCTIONS). nal outer coat of the Graafian follicle, which in all the transformations of the latter suffers no change, until the time arrives when the whole body finally shrinks and disappears. The position and relations of this coat to surrounding parts leave no room for doubt as to its identity. Nothing bounds it externally but the stroma of the ovary. Nothing lines it internally but the yellow ovisac. Neither between its outer nor its inner surfaces, and the corresponding structures just named, is there at an
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. OVARY — (FUNCTIONS). nal outer coat of the Graafian follicle, which in all the transformations of the latter suffers no change, until the time arrives when the whole body finally shrinks and disappears. The position and relations of this coat to surrounding parts leave no room for doubt as to its identity. Nothing bounds it externally but the stroma of the ovary. Nothing lines it internally but the yellow ovisac. Neither between its outer nor its inner surfaces, and the corresponding structures just named, is there at any time found any substance or me- dium interposed. This coat has undergone no material thickening, and its histological elements are simply those of the outer coat of the follicle, the same as before impregna- tion has occurred. Proceeding inwards, the next coat is yel- low ; it has a nearly uniform thickness of ly. In its substance may still be seen traces of the original foldings or convolutions. These are more easily shown upon the sur- face of the first section (fig. 386.), but are less obvious in one carried deeper so as to include the centre of the follicle, where the Fig. Deeper section of the same Graafian follicle as in fig. 386. The cavity, which contains a remarkably clear fluid, is exposed. (Ad Nat.) a, outer vascular coat (tunic of the ovisac); 6, inner yellow coat, or corpus luteum (ovisae) ; c, white membrane lining the cavity (a new forma- tion) ; d, cavity empty. coat shows greater solidity (fig. 387.). Up to this time, however, and sometimes later, the vessels still traversing this coat in the lines of its former convolutions may be traced in many specimens, and the capillaries may still be filled by a successful injection to such an extent as to render the whole mass crimson.* Exa- mined by the microscope, the following results are obtained:—The yellow coat, \-\\'" thick, is soft, swells in water, and is easily torn into fragments which nevert
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