. Comparative anatomy. Anatomy, Comparative. 388 COMPARATWE ANATOMY A similar serous epithelium is reflected on the outer side of the pericardial cavity. The cavity between contains a small amount of fluid. The muscles of the myocardium are wound circularly around the heart and arranged in layers. The fibers of the outer layers run at approximately right angles to those of the inner layers, thus insuring a maximum contraction of the heart cavities during contraction or systole. ijt-LEFT SUBCLAVIAN ART. ARCH OF AORTA ""^-'PULMONARY ARTERY PULMONARY VEINS. 'post cava tricuspid' VALVE F
. Comparative anatomy. Anatomy, Comparative. 388 COMPARATWE ANATOMY A similar serous epithelium is reflected on the outer side of the pericardial cavity. The cavity between contains a small amount of fluid. The muscles of the myocardium are wound circularly around the heart and arranged in layers. The fibers of the outer layers run at approximately right angles to those of the inner layers, thus insuring a maximum contraction of the heart cavities during contraction or systole. ijt-LEFT SUBCLAVIAN ART. ARCH OF AORTA ""^-'PULMONARY ARTERY PULMONARY VEINS. 'post cava tricuspid' VALVE Fig. 325.—A diagram of the chambers of the mammalian heart and their associated vessels and valves. The walls of the ventricles are shown in black, those of the auricles are stippled. The direction of flow of blood is indicated by arrows. (Redrawn after Jammes.) The muscle of the atria is mostly independent of that of the ventricles and the two are separated by a connective tissue septum. There is, however, an atrioventricular bundle of specialized muscle fibers which extends from the atrial septum to the ventricular septum and serves to convey to the ventricles the rhythm of contraction of the atria. The atrio-ventricular valves are attached by chordae tendineae to the walls of the ventricles in such a manner as to open freely into the ventricles but to prevent the return of blood when the ventricles contract. The attachment of the chordae tendineae to the heart-wall is by means of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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