Which of the following structures participates in our experience of pain?
a. the red nucleus
b. the substantia nigra
c. periaqueductal gray
d. the superior colliculi
Question 2
The cerebral aqueduct links the
a. third and fourth ventricles.
b. two lateral ventricles.
c. fourth ventricle and the spinal canal.
d. fourth ventricle and the subarachnoid space.