56 ELEMENTS OF MAMMALIAN ANATOMY. 



basihyal ; and the thyrohyal. The dorsal end of the thyro- 

 lival is prolonged by a piece of cartilage, the chondrohyal. 

 The hyoid apparatus varies greatly among mammals. 

 In man it consists of a single bone composed of the body 

 or basihyal, two small cornua representing the cerato- 

 hyals, and two large cornua representing the thyrohyals. 

 The bone is suspended from the skull by ligaments cor- 

 responding to the bony chain in the cat. 



PRACTICAL QUESTIONS AND SUGGESTIONS. 



1. How many more bones present in the cat than in man? 



2. In what two parts of the skeleton does the number of bones in 

 the cat exceed those in man? 



3. What is a sesamoid bone? 



4. Find on a specimen a sesamoid bone and describe it. 



5. Draw a lateral aspect of the skull and label all parts 



6. What are the paired bones of the cranium? 



7. Name the single bones of the face. 



8. Draw the caudal aspect of the skull and label all parts. 



9. Which bones of the skull derive their names from their location? 



10. Which bones of the skull are pierced by more than two foramina? 



11. Write a description of the orbital cavity. 



12. Which foramina of the skull derive their names from their shape 

 or size? 



13. Which foramina derive their names from their location? 



14. Which foramina transmit important blood-vessels? 



15. Draw figures representing relative shapes and sizes of all foramina 

 of the skull. 



16. What bones enter into the formation of the brain cavity? 



17. Write about 200 words describing the nasal cavity. 



18. Draw a ventro-lateral aspect of the auditory bulla and label all 

 features. 



19. Write a description of the auditory bulla and name some mam- 

 mals in which it is absent. 



20. Which bones of the skull are composed of more parts in the young 

 than in the adult? 



21. Name the principal sutures of the skull. 



22. Name the parts of the sphenoid bone in the order of size. 



23. Name the bones of the skull visible from the dorsal aspect. 



24. Name the bones of the skull visible from the cephalic aspect. 



25. What bone of cranium paired in the cat is single in man? 



