24 



STRUCTURE OF THE HUMAN BODY 



and the -fibula, or slender splint bone. The enlarged 

 ends of the femur and the tibia meet together to form 

 the knee joint. 



Foot Connected with the lower ends of the tibia and 

 the fibula by means of the ankle joint are the bones of 

 the ankle. They are a series of strong irregular block- 



FIG. 19. Skeleton of foot of a man (A) and a gorilla (B), showing the more 

 flexible ankle and prehensile big toe of the gorilla. 



like bones, which are fastened firmly together by liga- 

 ments. They form the ankle r heel and a portion of the 

 arch of the foot. Jointed to the front of this series there 

 are five slender bones, which complete the arch and reach 

 to the ball of the foot. As in the hand, the ends of the 

 second, third, fourth and fifth of these have three short 



