I9 2 ELEMENTS OF MAMMALIAN ANATOMY. 



away with the forceps. The superior one, known also as 

 the brachium conjunctvvum, extends as a cord of fibers 

 along the cranial half of the fourth ventricle and then 

 beneath the corpus quadrigeminum. The inferior pedun- 

 cle, or restiform body, forms part of the boundary of the 

 caudal half of the fourth ventricle and enters the cere- 

 bellum between the other two peduncles. It is composed 

 of fibers from the spinal cord and medulla. 



PRACTICAL QUESTIONS AND SUGGESTIONS. 



1. Describe the meninges of the central nervous system. 



2. Which of the five parts of the brain are exposed dorsally? 



3. Draw the lateral aspect of the brain and label all features. 



4. Draw the ventral aspect of the brain and label all features. 



5. Draw the dorsal aspect of the brain after the dorsal portion, in- 

 cluding corpus callosum and fornix, has been removed. 



6. Describe the differences existing between the gyri and sulci of 

 your specimen and the one described in the text. 



7. Write a description of the ventricles, giving dimensions and 

 boundaries. 



8. Describe the attachment of the pineal body. 



9. Which of the cranial nerves derive their name from their func- 

 tion? 



10. Name the foramina giving passage to one or more of the 

 cranial nerves. 



11. From which of the five parts of the brain do most of the cranial 

 nerves originate? 



12. Describe the choroid plexus. 



13. What is the internal capsule? 



14. Draw a cross-section of the brain made by cutting through the 

 optic commissure and label all parts. 



15. Draw a cross-section of the brain made by cutting through the 

 middle commissure and label all parts. 



16. Draw a cross-section of the brain made by cutting through the 

 corpora quadrigemina and label all parts. 



17. Write a description of the corpus callosum. 



18. Which is the smallest commissure of the brain? 



19. Explain the difference in structure between the white and gray 

 matter. 



20. Describe the cerebellum. 



