Which statement is true about cerebellar nerve fibers?

• A. They cross to the opposite side in the cerebellum
• B. They do not cross in the cerebellum
• C. They cross in the brainstem
• D. They cross in the cerebrum

Answer: (B)

The main idea is that the cerebellar connections operate largely on the same side they affect. In the cerebellum itself, nerve fibers do not cross from one side to the other. This means the cerebellum processes information and coordinates movements ipsilaterally, with crossing that happens outside the cerebellum as fibers exit toward other brain regions. So the statement that cerebellar nerve fibers do not cross in the cerebellum is the correct summary. (Crossing can occur elsewhere, such as along pathways that connect to or leave the cerebellum, but not within the cerebellar cortex itself.)