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Appendix Brainstem Vertebral Artery Brain Brainstem CN V, VII, IX, X, and XI Cranial nerves 0 a U O O C O Spinal cord ci The brainstem extends from the brain; it lies on the underside of the brain and is the beginning of the spinal cord. Cranial nerves, except for cranial nerves I (olfactory) and II (optic), originate in the brainstem. The vertebral artery supplies blood to the brainstem and the five cranial nerves. 219 EFTA00809947