. The American journal of anatomy . RO A V. B. Fig. 17 The same as fig. 16 from the heart of an embryo 17 mm. long (No. 296).Most of the muscle wall of the atrial canal is absent. The atrio-ventricular bundleis shown and thp semilunar valves of the aorta are A Fig. 18 Pketch of the base of an adult heart showing the valves. The atrio-ventricular bundle is shown. The figure may be compared with figs. 15, 16 and17. end of the medial and anterior cusp of the tricuspid valve, whilethe same tip of the valve is tied to the by the medial tendonwhich frequently enlarges into a
. The American journal of anatomy . RO A V. B. Fig. 17 The same as fig. 16 from the heart of an embryo 17 mm. long (No. 296).Most of the muscle wall of the atrial canal is absent. The atrio-ventricular bundleis shown and thp semilunar valves of the aorta are A Fig. 18 Pketch of the base of an adult heart showing the valves. The atrio-ventricular bundle is shown. The figure may be compared with figs. 15, 16 and17. end of the medial and anterior cusp of the tricuspid valve, whilethe same tip of the valve is tied to the by the medial tendonwhich frequently enlarges into a papillary muscle. In followingits development it is found that this tendon marks the primary 276 FRANKLIN P. MALL union of the septum aorto pulmonale to the valve and in its sub-sequent development is separated from the septum as the valveenlarges. The beginning of this process is shown in fig. 19 whichis from a section of embryo 86 (30 mm.). It is here seen that thevalve mass is enlarging and that its lower border is being sepa-rated from the muscle of the right ventricle as the tendinous cordsare forming. In so doing the medial papillary muscle is formingand at the same time the trabeculae which encircle the base of the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
