CHAP. V.] 



JOINTS. 



DlARTHROSIS, 

 OR 



MOVABLE JOINT. 



1. Arthrodia. Gliding joint; articulates by plane 

 surfaces which glide upon each other. 



2. Ginglymus. Hinge joint; moves backwards and 

 forwards in one plane. 



3. Enarthrosis. Ball and socket joint; articulates 

 by a globular head in a cup-like cavity. 



4. Diartlirosis rotataria. Articulates by a pivot 

 process turning within a ring, or by a ring turn- 

 ing round a pivot. 



