202 



HITCHCOCK'S 



ANATOMY 



many of the fibers of the heart 

 anastomose, or join with each 

 other in many places, as is 

 seen in Fig. 203. The heart 

 is a double organ, one side 

 being called the arterial and 

 the other the venous, or left 

 and right hearts, since the for- 

 mer receives and propels the 

 pure or arterial blood, while 



Anastomosing Fibers of the Human Heart. the latter circulates VenOUS 



blood. Again, each of the two sides or hearts are divided 

 into an auricle and a ventricle. Each of these four cavities 

 will ordinarily contain about three fluid ounces, making the 

 whole heart to contain nearly a pint. 



367. The Auricles and Ventricles.— The Auricles are 

 the uppermost cavities of the heart, and are somewhat smaller 



Fig. 204. 



vj ac t ac vj 



Lungs, Heart, and Principal Vessels in Man. od, Eight Auricle, vd, Right Ventricle. 

 Vff y Left Ventricle, a, Aorta, ac, Carotid Arteries. i?c, Vena Cava, t, Trachea, vj, 

 Jugular Veins. 



What are its shape, size, and four cavities called ? What is the capacity of an adult 

 heart ? 



