Final answer:
Crude sensation awareness is typically processed in the spinal cord and brain stem of the central nervous system, facilitating simple reflex actions without the detailed involvement of the cerebral cortex.
Step-by-step explanation:
Sensory impulses ending in crude sensations are generally associated with the spinal cord and brain stem rather than the highly specialized areas of the cerebral cortex. Unlike the finer and more precise perceptions which involve detailed processing in the primary sensory areas, associative regions, and integrative multimodal areas of the cortex, these crude sensations are processed in more primitive regions of the central nervous system (CNS).
The spinal cord in particular is a site where simple reflexes occur without the involvement of higher brain centers, manifesting in quick, involuntary movements such as withdrawing your hand from a hot object. The ascending pathways from the spinal cord carry these crude sensations to the brain, where they may be further processed but initially, they are not as finely mapped as the sensations that reach the cortex directly.