. The anatomy of the horse; a dissection guide. Horses. DISSECTION OF THE PELV] 353 The Graafian follicles vary greatly in size. The smallest are imbedded in the cortical part of the ovary. These are of microscopic size, and differ from the larger follicles in having only a single layer of cells in the membrana granulosa, and in having no liquor folliculi. Follicles of intermediate size are placed more deeply in the ovary, and differ from the largest chiefly in the small amomit of liquor that they contain. These differences of size represent different stages of development of the follicles, th
. The anatomy of the horse; a dissection guide. Horses. DISSECTION OF THE PELV] 353 The Graafian follicles vary greatly in size. The smallest are imbedded in the cortical part of the ovary. These are of microscopic size, and differ from the larger follicles in having only a single layer of cells in the membrana granulosa, and in having no liquor folliculi. Follicles of intermediate size are placed more deeply in the ovary, and differ from the largest chiefly in the small amomit of liquor that they contain. These differences of size represent different stages of development of the follicles, the largest being the most mature. When mature, a follicle occupies a considerable space in the substance of the ovary in the neigh- bourhood of the hilus. Finally it bursts through the surface of the. Fig. 45. Sl-ctiox of Cat's Ovary, magnified (from Schron). 1. Outer covering of the ovary ; 2. Fibrous stroma ; 3. Superficial layer of fibro-nuclear substance; 3'. Deeper parts of the same ; 4. Blood-vessels ; 5. Ovi-sacs forming a layer near the surface ; 6. One or two of the ovi-sacs sinking deeper and beginning to enlarge ; 7. One of the ovi-sacs farther developed, now enclosed by a prolongation of the fibrous stroma, and consisting of a small Graafian follicle, within which is situated the ovum covered by the cells of the discus proligerus ; 8. A follicle farther advanced; 8'. Another which is irregfularly compressed ; 9. the greater part of the largest follicle, in which the following parts are seen ; a. Cells of the tunica granulosa lining the follicle ; 6. The reflected portion named discus proligerus ; c. Vitellus or yelk part of the ovum, surrounded by the zona pellucida ; d. germinal vessicle ; e. Germinal spot. ovary, and the ovum, along with the liquor folliculi and part of the membrana granulosa, escapes and is caught by the expanded extremity of the Fallopian tube. The follicle then collapses, while it becomes in part filled with blood from the vessels opened by the
Size: 2042px × 1224px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjecthorses, bookyear1884
