. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE HEART. 587 The hase of the auricular mass, opposed to the base of the ventricles, is separated from it at its periphery by the horizontal groove {aimculo-vmtricular groove) of the heart. 3. Inteknal Conformation of the Heart (Figs. 351, 352, 358). Preparation.—It sufBces to make a longitudinal incision before and behind the organ, in order to expose its cavities. (I have followed Wilson's directions for many years when examining the interior of the heart, and as a careful inspection of this organ is often necessary
. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE HEART. 587 The hase of the auricular mass, opposed to the base of the ventricles, is separated from it at its periphery by the horizontal groove {aimculo-vmtricular groove) of the heart. 3. Inteknal Conformation of the Heart (Figs. 351, 352, 358). Preparation.—It sufBces to make a longitudinal incision before and behind the organ, in order to expose its cavities. (I have followed Wilson's directions for many years when examining the interior of the heart, and as a careful inspection of this organ is often necessary in the course of an autopsy, I think the student should practise the best method of laying open these cavities. The riglit auricle is prepared by making a transverse incision along its ventri- cular margin, from the appendix tu its right border, and crossed by a perpendicular incision, carried from the si<]e of the anterior to the pos- terior cava. The right ventricle is laid open by Fig. 351 making an incision parallel with, and u little to the right of, the middle line, from the pulmonary artery in front, to the apex of the heart, and thence by the side of the midille line behind to the auriculo-ventricular opening. The interior of the left auricle is expn^ed by a J_-shaped 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 ventriculorum, and coutiuuing it around the apex of the heart to the auriculo- ventricular opening behind.) If the heart, when viewed externally, appears to be a simple organ, it is not so when examined internally. The vertical septum which divides it into two bil ocular 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 septum
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