. Elementary physiology. Physiology; Physiology. The Circulatory System. 119 ventricle, being situated slightly higher than the auriculo- ventricular opening, and is guarded by a valve with three pouch-like (semilunar) flaps (see Fig. 66), called \kv^ pulmonary scmiliuiar valve^ which opens towards the artery. The construction on the left side of the heart is very similar to that on the right, except that everything is more strongly. Fig. (>(>.—View of the base of the ventricular part of the heart, showing the relative position of the arterial and auriculo-ventricular orifices. (Allen Th
. Elementary physiology. Physiology; Physiology. The Circulatory System. 119 ventricle, being situated slightly higher than the auriculo- ventricular opening, and is guarded by a valve with three pouch-like (semilunar) flaps (see Fig. 66), called \kv^ pulmonary scmiliuiar valve^ which opens towards the artery. The construction on the left side of the heart is very similar to that on the right, except that everything is more strongly. Fig. (>(>.—View of the base of the ventricular part of the heart, showing the relative position of the arterial and auriculo-ventricular orifices. (Allen Thomson.; \ The muscular fibres of the ventricles are exposed by the removal of the pericardium, fat, blood-vessels, etc ; the pulmonary artery and aorta and the auricles have been removed ; the valves are in the closed condition, i, i, right ventricle ; i', conus arteriosus ; 2, 2, left venticle ; 3, 3, the divided wall of the right auricle ; 4, that of the left ; 5, the inlundibular ; 5', the right, and 5", the septal segment ot the tricuspid valve ; 6, the anterior or aortic, and 6', the posterior or parietal segment of the mitral valve (in the angles between these segments are seen smaller lobes); 7, the pulmonary artery; 8, placed upon the root of the aorta; 9, the right; 9', the left coronary artery. fashioned in the ventricle on account of the greater pressure to be overcome in the aorta. Four pulmonary veins enter the left auricle in man {I'ide supra), two from each lung opening close together into opposite sides of the cavity. To open the left auricle a cut should be made across the posterior surface from the right to the left pul- monary veins, and another shorter cut towards the front at right angles to this one. The mitral valve guarding the left auriculo- ventricular opening may next be floated up by pouring in water in a similar fashion to that directed above in the case of the tricuspid valve. // has only two flaps instead of three, but is. Please note that
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