84 



STUDIES IN ADVANCED PHYSIOLOGY. 



Along the outside of the tibia and serving to brace this ar- 

 ticulating surface with the femur lies the smaller fibula. 



MAUEOLUS 



Fig. 32. RIGHT TIBIA AND FIBULA, FROM 



STYLOID PROCESS 



Fig. 33. RIGHT RADIUS AND ULNA IN SUPI- 



NATION OF THE HAND. 



At the ankle the tibia articulates with the astragalus, 

 which, however, represents two of the tarsal bones grown 

 together. This fusion to form the astragalus explains the 

 presence of but seven tarsal bones. The large tarsal 

 bone forming the heel, into which the tendon Achilles is 

 attached, is the heel bone, or os,calcaneum. These tarsal 

 bones, then, connect with the metatarsal, which are in turn 

 followed by a series of three phalanges for each toe, and 

 two for the big toe. In the hands and feet, especially of 

 persons who are in the habit of doing hard manual labor, 



