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American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Anatomy) the posterior part of the forebrain
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|Noun||1.||betweenbrain - the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon|
corpus mamillare, mamillary body, mammillary body - one of two small round structures on the undersurface of the brain that form the terminals of the anterior arches of the fornix
infundibulum - any of various funnel-shaped parts of the body (but especially the hypophyseal stalk)
pineal eye, third eye - a sensory structure capable of light reception located on the dorsal side of the diencephalon in various reptiles
neural structure - a structure that is part of the nervous system
nervus opticus, optic nerve, optic tract, second cranial nerve - the cranial nerve that serves the retina
hypophysis, pituitary, pituitary body, pituitary gland - the master gland of the endocrine system; located at the base of the brain
forebrain, prosencephalon - the anterior portion of the brain; the part of the brain that develops from the anterior part of the neural tube
basal ganglion - any of several masses of subcortical grey matter at the base of each cerebral hemisphere that seem to be involved in the regulation of voluntary movement
thalamus - large egg-shaped structures of grey matter that form the dorsal subdivision of the diencephalon
hypothalamus - a basal part of the diencephalon governing autonomic nervous system
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