THE SKELETON 33 



/ Ilium. 

 I Ischium. 

 I Pubis. 



Hip .... 2 Ossa innominata . - Acetabulum a cavity which 



articulates with the round- 

 ed head of the femur 

 ball and socket. 

 Upper head articulates with 

 the acetabulum. 



Thigh . Femur . J Snaft - 



' Lower head forms a hinge 

 joint with the head of the 

 tibia. 



Knee . . . Patella Protects the knee-joint. 



/ Upper head articulates with 

 the femur. 



) Tibia J Shaft. 

 Lowerhead articulates with 

 ( the ankle. 

 Slender throughout its 



I 



Fibula 



length. 



Fixed to the tibia at both 



ends. 

 Ankle ... 7 Tarsal bones 



( Connect the bones of the 



Instep . . . 5 Metatarsal bones . < toes with those of the 



I ankle. 



Toes. . . 14 Phalanges. . J 2 in the great toe 



I 3 m each of the others. 



QUESTIONS ON LESSON IV. 



1. Describe the form and arrangement of the bones of the shoulder-girdle. 



2. Describe and compare the joints of the shoulder and elbow. 



3. In what way is the motion of the forearm limited ? 



4. How are the various movements of the hand brought about ? 



5. Describe the structure of the wrist. On what does its flexibility depend ? 



6. Describe the arrangement of the bones in the land. 



7. Describe the arrangement of the bones in the thigh and leg. How does 



this arrangement differ from that in the corresponding parts of the 

 upper limb ? 



8. Compare the shoulder-joint with that of the hip ; and the elbow-joint 



with that of the knee. 



9. Compare the arrangement of bones in the leg with that in the forearm. 



10. Describe the bones of the ankle and the foot. 



11. Write out, in tabular form, a complete list of thn bones in both upper and 



lower limbs ; and in such a manner as to show the parts which 

 correspond. 



