322 



DETAILED SYNTHESIS. 

 Fio. 211. 



Fig. 211 represents the chest opened. 16, the lungs, have receded a 

 little, a section of 17, the membrane, lining the chest having been made. 

 A portion of the pericardium, 1, has also been removed, exposing the 

 heart, 5, 8, one auricle, 4, and the commencement of its arteries, 6, 7, 9, 

 and 3, the inner extremity of one vein, seen above at 2; 10, the continua- 

 tion of 9, which is attached to 8, heart, behind 6; 11, 12, 13, branches; 14, 

 Thyroid gland ; 15, windpipe. 



bone to the spinal column, curving round the heart, and 

 forming a wall to enclose the cavity of each chest. These 

 partitions and the heart-case are formed of sinewy, and 

 their free surfaces of serous secretory, tissue. 



914. THE COMPARTMENTS OF THE HEART are four, in 

 pairs, named ventricles and auricles, right and left, pul- 

 monary and systemic. 



Describe Fig. 211. Does chest of Fig. 211 appear compressed ? Do Lungs and 

 Heart appear to fill it ? 914. What are ? 



