. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. Fig. 9-3. Heart, cranial view. 1 right cranial vena cava, 2 aorta, 3 pulmonary trunk, 4 left cranial vena cava, 5 conus arteriosus, 6 left auricle, 7 paraconal interventricular branch, 8 right ventricle, 9 apex of heart, 10 right cardiac v., 11 caudal vena cava, 12 right auricle, 13 right atrium, 14 pulmonary w. sinus lies ventrally to the opening of the caudal vena cava and also receives the veins draining the heart. The right cranial vena cava opens into the cranial part of the right atrium. The right atrioven- tricular opening
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. Fig. 9-3. Heart, cranial view. 1 right cranial vena cava, 2 aorta, 3 pulmonary trunk, 4 left cranial vena cava, 5 conus arteriosus, 6 left auricle, 7 paraconal interventricular branch, 8 right ventricle, 9 apex of heart, 10 right cardiac v., 11 caudal vena cava, 12 right auricle, 13 right atrium, 14 pulmonary w. sinus lies ventrally to the opening of the caudal vena cava and also receives the veins draining the heart. The right cranial vena cava opens into the cranial part of the right atrium. The right atrioven- tricular opening leads from the right atrium to the right ventricle. The left atrium, atrium sinistrum, lies dorsal to the left ventricle. It receives all the pulmonary veins. The left auricle lies caudal to the right auricle and is separated from the latter by the pulmonary trunk and aorta. The left atrioventricular opening leads from the left atrium to the left ventricle. Ventricles. The two ventricles form the bulk of the muscular heart. The wall of the right ventri- cle is thin, that of the left ventricle is thick. Inter- nally the ventricles are separated from each other by a muscular septum, septum interventricularx. Ex- ternally the position of the interventricular septum is indicated by the interventricular grooves. The right ventricle, ventriculus dexter, lies against the sternum and costal cartilages and to the left of the midline. Its large right atrioventricular opening, ostium atrioventriculare, is guarded by the tricuspic or right atrioventricular valve, valva atrioventricu- laris dextra. The valve consists of three leaflets or cusps. The parietal cusp, cuspis parietalis, is attached to the lateral border of the opening, the septal cusp, cuspis septalis, to the septal or medial border of the opening and the angular cusp, cuspis angularis, to the cranial border of the opening. Fibrous cords, chordae tendineae, attach the free ends of the cusps to papillary muscles, mm. papil- lares
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Keywords: ., bookcollectionbiodiversity, bookleafnumber13, booksubjectmammals
