. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. OVARY — (NORMAL ANATOMY). 551 nancy, and which result in the formation of the body termed the corpus lulcuin. Without entering upon the question of the number of laminae into which the walls of a Graafian follicle may be split by skilful mani- pulation, it will suffice to consider those only as distinct membranes or coats, which exhi- bit obvious differences of structure and rela- tionship, during the various phases of develop- ment and decay which the follicle undergoes from its first formation to its final disappear- a
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. OVARY — (NORMAL ANATOMY). 551 nancy, and which result in the formation of the body termed the corpus lulcuin. Without entering upon the question of the number of laminae into which the walls of a Graafian follicle may be split by skilful mani- pulation, it will suffice to consider those only as distinct membranes or coats, which exhi- bit obvious differences of structure and rela- tionship, during the various phases of develop- ment and decay which the follicle undergoes from its first formation to its final disappear- ance. In this view the walls of the Graafian follicle must be regarded as being composed of three membranes; and indeed but for the importance attached to the use of the third or innermost of these, which in any case is hardly more than a thin layer of granules, it would have sufficed if the coats of the vesicles had been enumerated as two only. The external fibrous or vascular coat (fig. 374. u,fig- 371. E) constitutes the tunic of the ovisac of Barry, the tunica fibrosa, S. thecafol- liculi of Baer. It forms no portion of the ori- ginal ovisac, but is a superadded part, derived from the parenchyma of the ovary. This coat closely embraces the ovisac, and partakes Fig. 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 fi
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