4 



Fir,. 79. i. Extensor surface of right ulna, divided by a vertical line which is made by the aponeurotic 

 covering of the deep muscles ; these, therefore, lie between it and the interosseous edge. Thus the 

 surface A is for superficial muscles ; it is covered by Ext. carpi ulnaris, but does not afford origin to it, 

 and is continued below into the groove for this tendon. 2. Right radius from behind. H is covered 

 by Radial Extensor tendons ; C by Ext. oss. met. and Ext. br. poll., which cross the radial tendons 

 further out. D is for Ext. long, poll., which crosses the radial tendons in the hand (Fig. 93). 3. Outer 

 side of radius with muscles and tendons in position. Compare with Fig. 80. 



