THE CHEST 19 



Ribs. Of these appendages of the axial skeleton, 1 the 

 ribs are of great importance since they enclose and pro- 

 tect the heart and lungs. They also make breathing 



FIG. 15. The skeleton of the trunk Been from the front. C, clavicle ; S, scapula; 

 Oc, pelvic bone attached to the side of the sacrum dorsally. 



possible by furnishing stiff yet movable walls for the 

 chest cavitv in which the lungs lie. Through the sternum 



1 The axial skeleton is that part of the skeleton which forms the 

 central line or axis of the body, 



