Biological termHard1 mark
1(a)
Name the following:
The part of the brain that carries impulses from one hemisphere of the cerebellum to the other.
Topic: Pons
Previous-year question practice database
Answer
Exam answer
PONS (pons Varolii).
Explanation
The PONS is a broad band of nerve fibres lying in the brain stem, above the medulla oblongata. It acts as a BRIDGE — which is exactly what the Latin word pons means — carrying impulses between the two hemispheres of the CEREBELLUM, and between the cerebellum and the rest of the brain.
DO NOT CONFUSE IT with the CORPUS CALLOSUM, which is also a bridge of nerve fibres but joins the two hemispheres of the CEREBRUM. The question specifies the cerebellum.
Two bridges, two structures: CORPUS CALLOSUM — between the two halves of the CEREBRUM PONS — between the two halves of the CEREBELLUM
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