In general sensory pathways, to which brain regions do impulses ascend before CNS integration?

• A. Spinal Cord Only
• B. Midbrain and Thalamus
• C. Pons and Medulla
• D. Cerebellum and Cortex

Answer: (B)

Signals from somatic receptors travel into the CNS and ascend through brainstem regions, passing through the midbrain on their way to the thalamus. The thalamus then relays the information to the cerebral cortex, where conscious perception and integration occur. The midbrain and thalamus together represent the main relay stations before cortical processing. The cerebellum mainly handles coordination of movement rather than conscious sensory integration, and the final integration happens in the cortex after the thalamus.