34 Life and Health 



47. The Sternum, or Breastbone. In shape the sternum, 

 or breastbone, somewhat resembles an ancient dagger. It is 

 a long, flat, narrow bone, forming, the middle front wall of the 

 chest . It is connected directly with all the true ribs, indirectly 

 through cartilages with all the false ribs, except the " float- 

 ing" ribs. It also gives attachment to the collar bones. 



48. The Pelvis. Four immovable bones are joined 

 together so as to form at the lower extremity of the 

 trunk a basin-like cavity called the pelvis. These four 

 bones are the sacrum and the coccyx, which have been 

 described, and the two hip bones. 



49. The Hip Bones. The hip bones are large, irregularly 

 shaped bones, very firm and strong, and are often called 

 the haunch bones, or nameless bones (ossa innominatd). 

 They are united to the sacrum behind and joined to each 

 other in front. On the outer side of each hip bone is a 

 deep cup, or socket, into which fits the rounded head of 

 the thigh bone. It is called the acetabulum, because it 

 resembles an ancient vinegar cup. 



THE BONES OF THE UPPER LIMBS 



50. The Bones of the Upper Limbs. Each of the upper 

 limbs consists of the shoulder, arm, forearm, and hand. 



The thirty-two bones of each upper limb are usually 

 classified as follows : 



f Scapula, or shoulder-blade. 

 Shoulder: ^ Clavicle) or collar bone . 



Ann : . . Humerus, or arm bone. 

 Forearm: 



C 8 Carpal, or wrist bones. 

 Hand : . . J 5 Met a car pal bones. 



I 14 Phalanges, or finger bone*. 



