The region of the brain that encloses the third ventricle and immediately rostral to the brainstem, and includes the thalamus, epithalamus, and hypothalamus is the diencephalon.
Thalamus is an oval structure within the middle of your brain. It's called a relay station of all incoming motor (movement) and sensory data — hearing, taste, sight and bit (but not smell) — from your body to your brain.
The epithalamus is a posterior (dorsal) phase of the betweenbrain. The epithalamus includes the habenular nuclei and their interconnecting fibers, the habenular commissure, the stria medullaris and therefore the epiphysis cerebri. Epithalamus. medial facet of a brain divided within the median mesial plane.
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