THE PRINCIPLES OF MYODYNAMICS. 6 1 



44. Some of the dynamic relations of the 

 wrist-joint are important. 



(i.) There is generally an inward and for- 

 ward obliquity of the floor of the base of the 

 radius of lo or i5 degrees. 



(2.) The tendons of the flexors meet the 

 plane of the floor of the base of the radius at 

 an angle somewhat greater than lo or i5 de- 

 grees. 



(3.) The tendons of the extensors of the thumb 

 meet the plane of the floor of the base of the 

 radius at an angle greater than lo or i5 de- 

 grees. 



(4.) The tendons of the rest of the extensors 

 of the hand meet the plane of the floor of the 

 base of the radius at an angle somewhat less 

 than 10 or i5 degrees. 



(5.) The tendons that span the wrist-joint act 

 as ligaments. They come against the base of 

 the radius and help prevent displacements of 

 the hand. 



(6.) The carpus moves forwards, outwards, 

 backwards, and inwards in the concavity of the 

 base of the radius. 



