. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. HEART OF THE EMBRYO OF A RABBIT, THE SAME, SEEN FROM BEHIND. SEEN FROM BEFORE. ^^ Venae omphalo-mesentericae; d, right ta, Truncus arteriosus ; U left ventricle ; r, auricle; e, bulbus aortse-, /, the six aortic right ventricle; a,auricle; t;, venous sinus. arches; c, atrium ; 6, auricula?. cular cavity. Nailer'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, however. The ventricular cavity is the first to be divided int
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. HEART OF THE EMBRYO OF A RABBIT, THE SAME, SEEN FROM BEHIND. SEEN FROM BEFORE. ^^ Venae omphalo-mesentericae; d, right ta, Truncus arteriosus ; U left ventricle ; r, auricle; e, bulbus aortse-, /, the six aortic right ventricle; a,auricle; t;, venous sinus. arches; c, atrium ; 6, auricula?. cular cavity. Nailer'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, however. The ventricular cavity is the first to be divided into two compartments, 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 coiTesponds to an interventricular septum, which insensibly rises from the bottom of the ventricles ; when it reaches the auricles, it concurs in forming the auriculo-ventricular 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 compartments are then four in number. Externally, there is observed a depression which shows the division in the auricles ; at a point corresponding to it, a septum is developed in their interior which remains incom- plete during the whole of foetal life, being perforated by the foramen of Botal. With regard to the aortic bulb, it contracts and divides into two vessels—the aorta and pulmonary artery. ' This septum is sometimes arrested in its development, whence results an abnormal com- munication between the ventricles. Some instances have been given when describing the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - col
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Keywords: ., bookauthorcha, bookcentury1900, bookdecade1900, booksubjecthorses
