. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. THE UEABT. 587 The hasie of the auricular mass, opposed to the base of the ventricles, is separated from it at its periphery by the horizontal groove {aurkulo-ventricular groove) of the heart. '^. LvTERNAL Conformation of the Heart (Figs. 351, 352, 353). Preparation.—It suffices to make a longitudinal incision before and behind the organ, in order to expose its ciivities. (I have followed Wilson's directions for many years when examining the iuterioi-of the heart, and as a careful inspection of this organ is oft
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. THE UEABT. 587 The hasie of the auricular mass, opposed to the base of the ventricles, is separated from it at its periphery by the horizontal groove {aurkulo-ventricular groove) of the heart. '^. LvTERNAL Conformation of the Heart (Figs. 351, 352, 353). Preparation.—It suffices to make a longitudinal incision before and behind the organ, in order to expose its ciivities. (I have followed Wilson's directions for many years when examining the iuterioi-of the heart, and as a careful inspection of this organ is often neci ssary in the course of an autojisy, I think tlie student sliould practise the best metliod of laying open these cavities. The rigiit auricle is prepared by making a transverse incision along its ventri- cular margin, from the iippeudix to its right border, and crossed by a perpeudicular incision, carried from the side of the anterior to the pos- terior cava. The right ventri-le is laid open by making an incision parallel with, and a little to the right of, the middle line, from the pulmonaiy artery in front, to the apex of the heart, and thence by the side of the middle line behind to the auriculo-ventricular opening. The interior of the left auricle is exposed by a _L-8haped incision, the horizontal section being made along the border which is attached to the base of the ventricle. The latter is opened by making an incision a little to the left of the septum veutriculorum, and continuing it around the apex of the heart to the auriculo- ventricular opening behind.) If the heart, when viewed externally, ap})ears to be a simple organ, it is not so when examined internally. The vertical septum which divides it into two bilocular cavities, in reality makes two hearts of it—one for the dark, the other for the red blood. We will suc- cessively study these two cavities, by com- mencing with the partition that separates them. A. Cardiac Septum.—The superior part of this s
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