Myelin sheaths surrounding nerve fibers in the peripheral nervous system are produced by ____.
a. Schwann cells
b. microglia
c. satellite cells
d. astrocytes
Question 2
Cells that line the fluid-filled ventricles of the brain, some of which produce cerebrospinal fluid, are called ____.
a. oligodendrocytes
b. astrocytes
c. microglia
d. ependymal cells