SKELETON 15 



2. The Femur is the bone of the thigh. It has 

 a rounded head, which rests in the acetabulum. 

 External to the head of the femur is a rough ele- 

 vation, the great trochanter. On the posterior 

 side of the femur is a rough line for the attach- 

 ment of muscles, the linea aspera. On the poste- 

 rior side of the lower end of the femur are two 

 rounded articular elevations, the external and in- 

 ternal condyles. The patella or knee-pan is the 

 small oval bone which is imbedded in the tendon 

 on the anterior side of the lower end of the fe- 

 mur. (Plate I., R.) 



3. The Tibia and Fibula are the two bones of the 

 leg next below the femur. The tibia is the larger 

 bone, and has at its upper end two articular sur- 

 faces which receive the condyles of the femur. 

 On either side of these two surfaces are two pro- 

 jections, the external and internal tuberosities. 

 (Plate I., s and T.) 



4. The Tarsal Bones are the seven bones of the 

 ankle. The one with which the tibia articulates is 

 the astragalus. The largest of the tarsal bones, 

 the bone of the heel, is the calcaneum. 



5. The Metatarsals are five bones which articu- 

 late with the tarsals. The four external ones are 

 long and well-developed ; the inner one is very 

 small and rudimentary. 



6. The Phalanges are the bones of the toes. 

 There are three in each of the four toes. The in- 

 nermost metatarsal or hallux has no phalanges. 



