. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 552 UTERUS AND ITS APPENDAGES. from their supposed office in suspending the ovum, and retaining it in its proper situation in the Graafian follicle. That the retinacala, however, are not essen- tial structures is proved by the fact that they are wanting in many of the Mammalia as well as in Man. They have been observed chiefly in theRodentia and Ruminantia, where their form and number are subject to considerable varia- tion. The subjoined figure exhibits the ovum Fig. Ovum of rub/iit surrounded l>y the tunica gr
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 552 UTERUS AND ITS APPENDAGES. from their supposed office in suspending the ovum, and retaining it in its proper situation in the Graafian follicle. That the retinacala, however, are not essen- tial structures is proved by the fact that they are wanting in many of the Mammalia as well as in Man. They have been observed chiefly in theRodentia and Ruminantia, where their form and number are subject to considerable varia- tion. The subjoined figure exhibits the ovum Fig. Ovum of rub/iit surrounded l>y the tunica granulosa and portions of retinacula. {After Coste.') surrounded by the layer of granules which constitutes the tunica granulosa, and externally to this the radiating bands or retinacula, the whole of those parts, external to the ovum, being composed of nucleated cells. Besides these structures, the Graafian follicle contains a pellucid albuminous fluid, of a slightly yellowish colour, partially coagulable by heat. In this fluid float numerous granules similar to those of which the parts just de- scribed are formed, together with a varying quantity of oil-like globules. Lastly, in the midst of the granules at an early period, and subsequently in that more de- finite arrangement of them which constitutes the tunica gratiutosa, is contained the ovum (Jig. 374. /; and Jig. 376.), a full description of which is given in the article under that title. 4. Vessels and Nerves.—The ovary de- rives its supply of blood chiefly from the ovarian (spermatic), but in part also from the uterine arteries. So free, indeed, is the com- munication between these vessels, that the organ may be equally well injected from either source. The communication is effected chiefly by means of a branch of the ovarian artery, which passes inwards to inosculate with a ter- minal branch of the uterine artery, this anas- tomotic branch being occasionally so large as to constitute the principal source of supply of
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