218 ELEMENTS OF MAMMALIAN ANATOMY. 
PRACTICAL QUESTIONS AND SUGGESTIONS. 
1. Name the foramina of the skull giving passage to one or more 
cranial nerves. 
2. From a study of one or more specimens and the description in 
the book make a diagrammatic drawing of each cranial nerve. 
3. Which cranial nerves have their roots in the medulla? 
Name the cranial nerves which are wholly motor. 
Which of the cranial nerves do not supply structures of the head? 
Of what are ganglia composed? 
Make a drawing of your dissection showing the connection be- 
tween the spinal and sympathetic nerves. 
8. Which spinal nerves form the several plexuses? 
9. Make a drawing showing wherein the brachial plexus in your 
specimen differs from that described in the text. 
10. Write a description of your dissection of the nerves of the 
thoracic limb. 
11. Mention in what way the lumbar plexus differs from the descrip- 
tion in the book. 
12. Draw the great sciatic nerve and its branches as seen from the 
caudal aspect. 
13. What nerves supply the digits? 
14. Describe the chief plexuses of the sympathetic system. 
15. How do stimuli from the viscera reach the brain? 
16. What portion of the body is not supplied with nerves from the 
sympathetic system? 
Nags 
THE ORGANS OF SENSE. 
The organs of sense are the specialized peripheral termi- 
nations of the sensory nerves, and are so constructed as 
to be capable of receiving only a certain kind of stimulus. 
The stimuli for the eye are ether vibrations; those for the 
ear are vibrations of the air. The stimulation of the sen- 
sory nerves produces sensations in the cells of the cerebral 
cortex to which they lead. 
The external stimuli giving rise to the internal sensations 
of seeing, hearing, smelling, and tasting are transmitted by 
only four pairs of cranial nerves, while the stimuli of cu- 
taneous sensations are transmitted by three pairs of cranial 
nerves and all the spinal nerves. 
