Which of the following are projection fibers?
A. Corticospinal
B. Corticobrainstem
C. Thalamocortical
D. A and B
E. A, B, and C
ANS: E
Rationale: Projection fibers extend from subcortical structures to the cerebral cortex and from the cerebral cortex to the spinal cord, brainstem, basal ganglia, and thalamus.
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