The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc of the Royal college of surgeons of Edinburgh, in the summer of 1872 . ary, the right auriculo-ventricular orifice is occluded bya valve, which is partly muscular and partly tendinous; the mus-cular part, which is a continuation of two tolerably well-formedmusculi papillares, extending into the tendinous substance of thevalve, where it gradually loses itself. In the right ventricle of thecrocodile, a muscular valve, resembling th
The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc of the Royal college of surgeons of Edinburgh, in the summer of 1872 . ary, the right auriculo-ventricular orifice is occluded bya valve, which is partly muscular and partly tendinous; the mus-cular part, which is a continuation of two tolerably well-formedmusculi papillares, extending into the tendinous substance of thevalve, where it gradually loses itself. In the right ventricle of thecrocodile, a muscular valve, resembling that found in the rightventricle of birds, exists. In some birds the right auriculo-ventricular valve is altogethermuscular. It is usually described as consisting of two parts, fromthe fact of its dependent or free margin being divided into twoportions by a spindle-shaped muscular band, which connects itwith the right ventricular wall. As, however, the valve consistsof one continuous fold towards the base, and the two portions intowhich its free margin are divided, are applied during the systolenot to each other but to the septum, the valve in reality consistsof a singular muscular flap or fold, as shown at i of Fig. 139. Fig. Fig. 139.—Anterior aspect of turkeys heart, with right and left ventricles opened which occludes right auriculo-ventricular orifice, j, Musculus papillaris of fleshy valve Oom-Parf ; 9h «. Portion of septum to which valve is applied when closed. /, Left ventricle-. Tendinous valve which occludes left auriculo-ventricular orifice, g, Musculus papillariswith chordse tendinese attached to tendinous valve.—Original. The muscular flap or fold extends from the edge and upper thirdof the septum -posteriorly to the fleshy pons anteriorly. It openstowards the interior of the ventricle in a direction from abovedownwards, and is deepest at the edge of the septum it gradually narrows anteriorly (i), it is somewhat triangularin shape, i
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectblo, booksubjectblood
