=====Diencephalon=====
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The diencephalon ("interbrain") is the region of the embryonic vertebrate [[neural tube]] that gives rise to posterior forebrain structures. In development, the forebrain develops from the [[prosencephalon]], the most anterior vesicle of the neural tube that later forms both the diencephalon and the telencephalon. In adults, the diencephalon appears at the upper end of the brain stem, situated between the cerebrum and the [[brainstem]]. 


====Components====
It is made up of four distinct components: the [[thalamus]], the [[subthalamus]], the [[hypothalamus]], and the epithalamus.
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In the first phase of [[central herniation]], the [[diencephalon]] and the medial parts of both [[temporal lobe]]s 
are forced through a notch in the [[tentorium cerebelli]].
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Lesions arising at the interface of the diencephalon and [[mesencephalon]] have lacked classification specificity. In fact, these neoplasms have been termed “thalamic,” “brainstem,” or “basal ganglia” tumors in the past.