. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. X s;-. Fig. 9-4. Heart, caudal view. 1 right azygos v., 2 right cranial vena cava, 3 pulmonary v., 4 right pulmonary a., 5 pulmonary w., 6 caudal vena cava, 7 left ventricle, 8 left auricle, 9 left cranial vena cava, 10 right pulmonary a., 11 aorta. The left ventricle, ventriculus sinister, lies caudo- dorsally to the right ventricle and to the left of the midline. Its atrioventricular opening, ostium atriov- entriculare sinistrum, is guarded by the bicuspid or left atrioventricular valve, valva atrioventricularis sinistra. The va
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. X s;-. Fig. 9-4. Heart, caudal view. 1 right azygos v., 2 right cranial vena cava, 3 pulmonary v., 4 right pulmonary a., 5 pulmonary w., 6 caudal vena cava, 7 left ventricle, 8 left auricle, 9 left cranial vena cava, 10 right pulmonary a., 11 aorta. The left ventricle, ventriculus sinister, lies caudo- dorsally to the right ventricle and to the left of the midline. Its atrioventricular opening, ostium atriov- entriculare sinistrum, is guarded by the bicuspid or left atrioventricular valve, valva atrioventricularis sinistra. The valve consists of the septal cusp cuspis septalis which is attached to the septal or medial aspect of the opening and the parietal cusp cuspis parietalis which is attached to the lateral aspect of the opening. Chordae tendineae attach the free edg- es of the cusps to papillary muscles. The outflow track of the left ventricle leads to the opening of the aorta, ostium aortae. The opening is guarded by three semilunar valvules: the valvula semilunaris dextra, septalis et sinistra. Innervation: The heart is innervated by sympa- thetic fibres from the sympathetic trunk, cervico- thoracic ganglion and middle cervical ganglion and by branches from the vagus nerves. Vascular System of the Heart. Heart mus- cle is supplied by the coronary arteries. The right coronary artery, a. coronaria dextra, leaves the right caudolateral aspect of the aorta. The right auricle covers the aorta at its origin. The artery passes cran- iolaterally to reach the coronary groove, turns cau- dally as the right circumflex branch, r. circumflexus, and enters the subsinuosal interventricular groove as the subsinuosal interventricular branch, r. inter- ventricularis subsinuosus. It supplies atrial and ven- tricular branches. The left coronary artery, a. coronaria sinistra, leaves the left caudolateral aspect of the aorta. It passes to the left, caudal to the pulmonary trunk, to reach the coronary groove. At the co
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