What structures compose the diencephalon?

Thalamus, hypothalamus, and epithalamus

Explanation:

Diencephalon, the central core of the brain is located superior to the midbrain. The thalamus, hypothalamus, and epithalamus together make diencephalon.

-Thalamus makes around 80% of the diencephalon. Thalamus consists of two nuclei of gray matter along with interspersed tract of white matter.

-Hypothalamus is the part of diencephalon that is present inferior of the thalamus.

-The pineal gland and habenular nuclei together make epithalamus that is located posterior to the thalamus.