In a sensory pathway, third-order neurons run from the thalamus to the sensory cerebral cortex.
Thalamus is a gray matter located in the center of the brain. It is the main center for the processing of all the signals that are transmitted to the different parts of the body. However, the thalamus does not control the signals in response to smell.
The cerebral cortex is the outermost layer of the brain. It is responsible for the processing of functions like language, thinking, reasoning, decision-making, etc. There are three functional areas: motor areas, sensory areas, and association areas.
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