OS INNOMINATA. 341 



sage of the large vessels to the leg. There are nine- 

 teen muscles attached to this bone, several of which are 

 the most powerful in the body. 



OS INNOMINATA. 



The os innominata, or nameless bone, so called on ac- 

 count of its irregular shape, is that to which the thigh 

 bones are attached. It is composed of three bones, all 

 of irregular forms, and in the adult, united into one. 

 These are the ilium, or haunch bone, the ischium or hip 

 bone, and the os pubis, or share bone. (See skeleton.) 



Fig. 4. 



Z- 

 BONES OF THE FOOT- 



Fig. 4 represents the upper surface of the bones of the 

 f< ot, which are twenty-six in number. 



The astragalus, where it is articulated with the tibia, 

 arises above the other bones and is marked f. The os 

 calcis or heel bone g. The three cuneiform, or wedge- 

 shaped bones, e. The tarsal bones forming the instep d. 

 The metatarsal bones, five in number, a, forming the 

 upper and arched part of the foot. The phalanges or 

 rows of bones forming the toes, b, c, and i, are three in 

 number. The whole number of bones in the phalanges 

 are fourteen, the great toe having only two, while the 



What is the os femoris ? Describe the several parts of this bone. What 

 is the os innominata, and of what bones is it composed ? How many bones 

 has the foot ? 



29* 



