. The cat : an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. chap, viii.] ORGANS OF RESPIRATION AND SECRETION. 249 blood-vessels, and some muscular fibres. It has an outer epithelial and contains embedded vesicles of various sizes—called covering, the ova* or true female sexual Graafian follicles—containing product. In the stroma of the ovary there is but little fibrous connective tissue. It is made up mainly of large spindle-shaped cells,* which surround the Graafian follicles, being arranged concentrically about them. Upon dividing the ovary,
. The cat : an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. chap, viii.] ORGANS OF RESPIRATION AND SECRETION. 249 blood-vessels, and some muscular fibres. It has an outer epithelial and contains embedded vesicles of various sizes—called covering, the ova* or true female sexual Graafian follicles—containing product. In the stroma of the ovary there is but little fibrous connective tissue. It is made up mainly of large spindle-shaped cells,* which surround the Graafian follicles, being arranged concentrically about them. Upon dividing the ovary, vesicles of various sizes are seen within,. ssf^ai Fig. 119.—Portion of the Section of the prepared Cat's Ovary, represented in the PRECEDING FIGURE, MORE HIGHLY MAGNIFIED. 1. Outer covering of the ovary. 2. Fibrous stroma. 3. Superficial layer of fibro-nuclear substance. Deeper parts of the same. 4. Blood-vessels 5. Ovigerms forming a layer near the surface. 6. One or two of the ovigerms sinking deeper, and beginning to enlarge. 7. One of the ovigerms further developed, now enclosed by a prolongation of the fibrous stroma, and consisting of a small Graafian follicle, within which is situated the ovum covere I by the cells of the discus proligerus. A follicle further advanced. Another which is irregularly compressed. The great r part of the largest follicle—in which the following parts are seen: a, cells of the membrana granulosa lining the follicl!; b, the reflected portion, named discus proligerus ; c, vitellus or yelk part of the ovum, sui rounded by the zona pellucida, d, germinal vesicle ; e, germinal spot. and these are much more numerous in the very young animal than in the adult. These vesicles, or " Graafian follicles," are naturally spherical or oval, and have three coats. The first and most external of these, the tunic of the ovisac, or tunica fibrosa, is a fibrous, vascular membrane, containing oval nuclei, but destitute of oil globules. The secon
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectanatomy, bookyear1881
