33 



APPLIED ANATOMY. 



REGION OF THE WRIST. 



By the wrist is meant the constricted portion of the upper extremity by which 

 the hand is joined to the forearm. We will include in its consideration the lower 

 portion of the forearm for about 4 cm. (ij4 in. ) above the radiocarpal joint, and the 



Fig. 338. Sawn section through the lower end of the radius to show its cancellous structure. 



joint itself. The wrist is so constructed as to permit of the movements of pronation 

 and supination of the bones of the forearm, to serve as a support for the hand, and 

 to allow movements of the hand in various directions. 



Radius 



Styloid process 



Scaphoid 

 Tuberosity of scaphoid 



Trapezium 



Ridge on trapezium 



Trapezoid 



Ulna 



oid process 



form 



FIG. 339. Anterior view of the lower ends of the radius and ulna and the carpal bones. 



BONES OF THE WRIST. 



We may include among the bones of the wrist the lower ends of the radius and 

 ulna and the first row of bones of the carpus, the scaphoid, lunate (semilunar), 

 cuneiform, and pisiform. 



