The _____ are the interneurons in the CNS which receive the signal from the first order neurons. Their cell bodies are found in the _____ of the spinal cord or in the _____, and convey their signals within the spinal cord, or to the thalamus or cerebellum.

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Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.