COMPARATIVE STUDY OF MAMALIAN SKELETON, 73 



other, enabling one to bend the back or 

 twist the spinal column. 



37. COMPARATIVE STUDY OF THE MAMA- 

 LIAN SKELETON. 



(At the American Museum of Natural History, 8th Ave. and 77th St.) 



NOTE. The skeletons of the lion, horse, seal, musk-ox, sea lion, 

 and elephant are among those best adapted for observation. 



A. Spinal column. 



1 . How many vertebrae are found in the neck 



(cervical) region? 



2. How many vertebrae bear ribs (dorsal ver- 



tebrae) ? 



3. How many vertebrae in the lumbar region? 



4. Can you determine how many vertebrae 



have united to form the sacrum? 



5. How many vertebrae in the tail (caudal ver- 



tebrae) ? 



6. In what regions of the spinal column are 



curves noticeable? How do they differ 

 from the curves in the human skeleton? 



7. Are spinous processes specially developed 



in any region? (The head is supported 

 by muscles attached to these processes.) 



B. Ribs and sternum. 



8. How many pairs of ribs has the animal? 



9. How many are attached to the sternum? 

 10. Is the sternum a single piece of bone? If 



not, of how many parts does it seem to 

 consist ? 



