38 ANATOMY AND PHYSIOLOGY FOR NURSES 



consisting of five bones, and the fourteen bones termed 

 the phalanges. The bones of the carpus, together with 

 the radius, enter into the formation of the wrist-joint. 

 The bones of the upper row are the scaphoid, semilunar, 

 cuneiform, and pisiform; those of the lower row, the 

 trapezium, trapezoid, os magnum, and unciform. 



The metacarpus forms the palm of the hand. The 

 phalanges form the fingers; each finger is made up of 

 three phalanges, the thumb, of two. Although classified 



FlG. 19.- Right carpal bones, dorsal surface: S, scaphoid; L, semilunar; 

 C, cuneiform ; P, pisiform ; U, unciform ; 7, os magnum ; 1 T, trapezoid ; T, 

 trapezium (Leidy). 



as long bones, they are also numbered among the short 

 bones "of the body. Bach bone is composed of a base, a 

 shaft, and an extremity. 



THE BONES OF -"THE 



EXl*REMITY- r 



The lower extremity is composed of the thigh, the leg, 

 and the foot. 



The femur, or thigh-bone, is the longest bone in the 

 body. The rounded head articulates with the acetabulum 

 of the os innominatum. The head is joined to the shaft 



