1. An unmyelinated nerve fiber is ______, whereas a myelinated nerve fiber is ______ gray, and composing the gray matter of the brain and spinal cord; white, and composing the white 2. What is the most basic level of CNS function? spinal reflex 3. What is a primary part of the diencephalon? Thalamus 4. What immune response causes inflammation and results in scars, and affects the myelin coating on axons throughout the spinal cord and brain? multiple sclerosis 5. Where is the fourth ventricle located? Brainstem 6. What is the composition of the intercellular matrix in connective tissue Protein fi bres and ground substance 7. Which of the following is NOT epithelial tissue the dermis