Diencephalon :: Diencephalon (n.) The interbrain or thalamencephalon; -- sometimes abbreviated to dien. See Thalamencephalon.
Encephalon :: Encephalon (n.) The contents of the cranium; the brain.
Epencephalon :: Epencephalon (n.) The segment of the brain next behind the midbrain, including the cerebellum and pons; the hindbrain. Sometimes abbreviated to epen..
Mesencephalon :: Mesencephalon (n.) The middle segment of the brain; the midbrain. Sometimes abbreviated to mesen. See Brain.
Rhinencephalon :: Rhinencephalon (n.) The division of the brain in front of the prosencephalon, consisting of the two olfactory lobes from which the olfactory nerves arise..
Thalamencephalon :: Thalamencephalon (n.) The segment of the brain next in front of the midbrain, including the thalami, pineal gland, and pituitary body; the diencephalon; the interbrain..