DIENCEPHALON By N., Sam M.S. - 8 Posterior part of the forebrain. DIENCEPHALON: "The diencephalon includes the thalamus, epithalamus, hypothalamus and pineal gland." Related Psychology Terms EMOTION (Theories) CEREBRAL CORTEX PITUITARY GLAND HUNGER DRIVE EFFECTORS PINEAL GLAND POSTERIOR COMMUNICATING ARTERY THALAMUS DESCARTES, RENE (1596-1650) MEDIAL FOREBRAIN BUNDLE Cite this page: N., Sam M.S., "DIENCEPHALON," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/diencephalon/ (accessed March 21, 2023).