. The comparative anatomy of the domesticated animals. Veterinary anatomy. HEART OF THE EMBRYO OP RABBIT, SEEN FROM BEFORE. ta, Truncus ."irteriosus; I, Left ven- tricle ; r. Right ventricle; a. Au- ricle ; V, Venous sinus. THE SAME, SEEN FROM BEHIND. a, Venae omphalo-mesentericae; d. Right auricle ; e, Bulbus aorta;; /, The six aortic arches ; c. Atrium ; b, Auriculje that its inferior part becomes superior; it then dilates at three points: the anterior and superior dilatation situated at the origin of the aorta is named the aortic bulb (bulbus aortce); the middle dilatation, the ventric
. The comparative anatomy of the domesticated animals. Veterinary anatomy. HEART OF THE EMBRYO OP RABBIT, SEEN FROM BEFORE. ta, Truncus ."irteriosus; I, Left ven- tricle ; r. Right ventricle; a. Au- ricle ; V, Venous sinus. THE SAME, SEEN FROM BEHIND. a, Venae omphalo-mesentericae; d. Right auricle ; e, Bulbus aorta;; /, The six aortic arches ; c. Atrium ; b, Auriculje that its inferior part becomes superior; it then dilates at three points: the anterior and superior dilatation situated at the origin of the aorta is named the aortic bulb (bulbus aortce); the middle dilatation, the ventricular cavity ; and the posterior dilatation, the auricular cavity. Sailer's passage is the name given to the constriction between the auricle and ventricle, which at this time are single. They do not remain long so, how- ever. The ventricular cavity is the first to be divided into two compart- ments, and the division is marked externally by a groove which appears on the surface of the heart of the Ovine embryo towards the nineteenth day, and on the twenty-fifth in the Equine foetus. This groove corresponds to an inter- ventricular septum which insensibly rises from the bottom of the ventricles ; when it reaches the auricles it concurs in forming the auriculo-veutricular openings. The margins of these openings are provided with a small slightly salient lip, which afterwards, in developing, originates the mitral and tricuspid valves. The heart has now three cavities : two ventricles and an auricle , but in a brief period the latter is doubled, and the comijartments are then four in number. Externally, there is observed a depression which shows the division. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Chauveau, A. (Auguste), 1827-1917; Arloing, S. (Saturnin), 1846-1911; Fleming, George, 1833-1901, tr. New Yo
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