. The comparative anatomy of the domesticated animals. Veterinary anatomy. 9 SUCCESSIVE STAGES IN THE FORMATION OF THE CORPUS LUTECM IN THE GRAAFIAN FOLLICLE OF A SOW (VERTICAL SECTION). a, The follicle immediately after the expulsion of the ovum, its cavity being filled with blood, and no ostensible increase of its epithelial lining having yet taken place; at b, a thickening of this lining has become apparent; at c, it begins to present folds, which are deepened at d, and the clot of blood is being absorbed and decolorized ; a continuance of the same process, as shown at e,f, g, h, forms the
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 9 SUCCESSIVE STAGES IN THE FORMATION OF THE CORPUS LUTECM IN THE GRAAFIAN FOLLICLE OF A SOW (VERTICAL SECTION). a, The follicle immediately after the expulsion of the ovum, its cavity being filled with blood, and no ostensible increase of its epithelial lining having yet taken place; at b, a thickening of this lining has become apparent; at c, it begins to present folds, which are deepened at d, and the clot of blood is being absorbed and decolorized ; a continuance of the same process, as shown at e,f, g, h, forms the corpus luteum, with its stellate cicatrix. canal at the middle is so narrow as scarcely to admit more than a very thin straw, and its calibre is still less towards the uterine extremity ; near the ovary, however, it is wide enough for the passage of a thick goose-quill. The orifice of the uterine extremity opens in a small and very hard tubercle. The ovarian extremity, in all Mammalia, offers a very remarkable arrangement. It opens into the peritoneal cavity, near the fissure of the ovary, and in the centre of the expansion named the pavilion of the tube, which is also designated the fimbriated extremity (or morsus diaboli). This pavilion is attached to the external side of the ovary, and has a very irregular outline—notched, as it is, into several lancet-shaped, unequal prolongations {fimbria), which float freely in the abdomen. Here are, then, two important anatomical facts—the discontinuity between a gland and its excretory duct, and the communication of a serous cavity fvith the exterior. Structure.—The Fallopian tube is formed of a serous, a muscular, and a mucous tunic. The serous {external) is furnished by the broad ligament, and is derived from the peritoneum. The middle is formed of unstriped muscular fibres, which extend into the pavilion. (They are arranged as circular—internal, and 65. Please note that these images are extracted from scanned page images that
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