. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Graafian vesicle of the rabbit x 100 (?) diameters. (After Barry.) a, outer coat or tunic of the ovisac; b, ovisac; c, epithelial lining or membrana granulosa, a por- tion of which has been removed in order to display del, retinacula (here too distinctly marked) ; e, tunica granulosa of Barry immediately surrounding the ovum, consisting of, /, zona pellucida, within which is the yelk and germinal vesicle and macula. in its spherical figure ; it carries numerous blood-vessels, which pass from the ovarian stroma to become
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Graafian vesicle of the rabbit x 100 (?) diameters. (After Barry.) a, outer coat or tunic of the ovisac; b, ovisac; c, epithelial lining or membrana granulosa, a por- tion of which has been removed in order to display del, retinacula (here too distinctly marked) ; e, tunica granulosa of Barry immediately surrounding the ovum, consisting of, /, zona pellucida, within which is the yelk and germinal vesicle and macula. in its spherical figure ; it carries numerous blood-vessels, which pass from the ovarian stroma to become expanded in a vascular net- work over its walls (fig. 371. D). Examined by the microscope, this membrane is seen to be highly vascular. It is composed of a fine membrane, containing few fibres, but everywhere abundantly studded with oval nuclei, visible without the aid of acetic acid, and probably, in part at least, due to the pre- sence of so many blood-vessels in its tissue. This coat contains no oil globules. Its chief use appears to be to give increased support and protection to the true ovisac which it sur- rounds, and to convey blood-vessels from the ovary for its nutrition, and for the supply of the fluids which the ovisac contains. The second or internal coat, as it is com- monly termed, of the Graafian follicle is the ovisac itself. It constitutes at first an inde- pendent structure; but receiving afterwards the before mentioned investment from the ovarian parenchyma, the two coats unite to form the Graafian follicle. The ovisac is. Fig. Structure of ovisac. (Ad J\'at. x ) composed of embryonic fibres of connective tissue (fig. 375. a), of rounded cells or granules, b; and of a large proportion of minute oil globules, c. The embryonic fibre-cells lie parallel with each other, and together with the granules form the bulk of the tissue in nearly equal proportions. The oil drops are very numerous; and after the preparation has been under examination for some t
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