SKELETON 



5399 



SKI 



1. Cranium 



2. Vertebrae 



3. Ribs 



4. Scapula or shoulder 



blade 



5. Clavicle or collar 



bone 



THE SKELETON 



6. Hip bone 



7. Coccyx 



8. Pubes 



9. Sacrum 



10. Femur or thigh bone 



11. Patella or kneecap 



12. Tibia 



the most marvelous structures of the body, for 

 it possesses just the right combination of ri- 

 gidity, flexibility and elasticity. 



The parts of the appendicular skeleton are 

 attached to the central axis in such a way as 

 to afford great freedom and variety of move- 

 ment. This portion of the framework con- 

 sists of the arm bones and the shoulder girdle 

 (pectoral arch) and the leg bones and hip 

 bones (pelvic arch). The pectoral arch is made 

 up on each side of a collar bone and a shoulder 

 blade ; the hip bones, or pelvic arch, of a single 

 structure called the os innominatum (bone 

 without a name). As may be seen by the 

 diagram, the collar bone on each side is at- 

 tached to the shoulder blade and also to the 

 breastbone, wjiile the bones of the lower limbs 

 join the pelvic arch in the hip joints. The 

 pelvic arch in turn is attached to the lower 

 part of the backbone. Thus all parts of the' 

 framework are joined together, and each part 

 has its work in the body mechanism. W.F.R. 



Related Subjects. The various parts of the 

 skeleton are discussed in more detail under the 

 following 1 headings : 

 Arm Foot 



Bone Hand 



Face, The Head 



The bones of the arm, foot, hand and head are 

 fully illustrated and named under those headings. 

 See pages 372, 2253, 2681, 2738. 



SKI, or SKEE, ske, a Norwegian name for 

 wooden runners from three to four inches 

 broad and from five to ten feet in length, used 

 by men, women and children of northern coun- 

 tries for walking over snow and for coasting 

 down snow-covered hills. , Skiing as a sport is 

 extremely healthful exercise, and numerous ski 

 clubs exist in all northern countries where 

 winter snows are plentiful. Contests to de- 

 velop skill are held in many places; these in- 

 clude long and short runs, but the greatest in- 

 terest always attaches to feats of jumping. 

 The contestants glide rapidly down a snow- 

 covered hill, and at a certain point in the de- 

 scent they are projected into the air by a sharp 

 elevation in the path, alighting at a great 

 distance down the hillside. A jump of 130 feet 

 is not unusual. 



The infantry soldiers of Sweden and Norway 

 are equipped with skis and accomplish very 

 long marches over the snow-covered ground. 

 In forest lands skis are not as useful as the 



13. Fibula 



14. Metatarsal bones 



15. Phalanges 



16. Sternum 



17. Humerus 



18. Ulna 



19. Radius 



20. Phalanges 



2-1, Metacarpal bones 



