90 



THE HUMAN MOTOR 



FIG. 97. 



Front section of the middle 

 of the head of the humerus. 



Section perpendicular 

 to the preceding. 



The figures 97 to 102 are sections of joint heads by Werner, f 1 ) 

 I. he sections being " sagittal " (antero-posterior) or " frontal " 

 (perpendicular to the preceding). The reciprocal positions of 

 the principal bones, and the relations between jointed surface?, 

 will be examined later. 



WSffi* 



Fie* 100, 

 Sagittal section at the middle of the head of the radius 



FIQ. 99* 



Sagittal section of the 

 ulna with the projec- 

 tion S of the olecranon. 



FM.101* 



Section of the middle of the 

 head of the femur. 



(*) Werner, Die Diche der menschlithenGelenkknorpel (Inaug. Dis*., Berlin, 

 1897) 



