The diencephalon rests superior to the brain stem. It consists of

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The diencephalon is composed of three distinct structures: the thalamus, hypothalamus, and epithalamus. The thalamus serves as a relay station for upward-moving sensory impulses. As a result, we can experience a crude recognition of both pleasant and unpleasant sensations. The hypothalamus, lying under the thalamus, plays a role in regulating body temperature, fluid balance, and metabolism. Additionally, it functions as the center for such drives as thirst, appetite, and sex. The epithalamus lies midline and behind the third ventricle; it contains the pineal gland, which synthesizes enzymes related to daylight sensitivity.

The Diencephalon Rests Superior to the Brain Stem