Interthalamic adhesion - wikipedia Interthalamic adhesion Interthalamic adhesion Dissection showing the ventricles of the brain. ( Interthalamic adhesion labeled as Massa Intermedia at center right. ) Coronal section of brain through intermediate mass of third ventricle. Details Part of thalamus Identifiers Latin Adhaesio interthalamica NeuroNames hier - 284 NeuroLex ID Interthalamic adhesion Dorlands / Elsevier a_15 / 12112692 TA A14. 1.08. 103 FMA 74869 Anatomical terms of neuroanatomy ( edit on Wikidata ) The interthalamic adhesion ( also known as the massa intermedia or middle commissure ) is a flattened band of tissue that connects both parts of the thalamus at their medial surfaces. The medial surfaces form the upper part of the lateral wall to the third ventricle. In mammals other than humans, it is a large structure. In humans it is only about one centimetre long, though In females it is larger by about 50 %. Sometimes it is in two parts and 20 % to 30 % of the time it is absent. In 1889, a Portuguese anatomist by the name of Macedo examined 215 brains, showing that male humans are approximately twice as likely to lack an interthalamic adhesion as are female humans. He anecdotally attributed the finding to a `` prevailing feature of people deprived of ( the interthalamic adhesion ) is to present in their psychical acts a remarkable precipitation, joined to a certain dysharmony between internal and external feelings ''. Its absence is seen to be inconsequential. The interthalamic adhesion contains nerve cells and nerve fibers ; a few of the latter may cross the middle line, but most of them pass toward the middle line and then curve laterally on the same side. It is still uncertain whether the interthalamic adhesion contains fibers that cross the mid-line and for this reason it is inappropriate to call it a commissure. The interthalamic adhesion is notably enlarged in patients with the type II Arnold - Chiari malformation. Additional images Thalamus Medial surface of cerebral hemisphere. Medial view. Deep dissection. WRONG INFORMATION - NEED REVIEW References This article incorporates text in the public domain from the 20th edition of Gray 's Anatomy ( 1918 ) Jump up ^ http://www3.interscience.wiley.com/cgi-bin/abstract/109691976/ABSTRACT?CRETRY=1&SRETRY=0 Jump up ^ REGIS OLRY AND DUANE E. HAINES, `` Interthalamic Adhesion : Scruples About Calling a Spade a Spade ? '' Journal of the History of the Neurosciences, 14 : 116 - 118, 2005 Jump up ^ Wolpert, S.M. ; Anderson, M ; Scott, R.M. ; Kwan, E.S. ; Runge, V.M. ( 1987 ). `` Chiari II malformation : MR imaging evaluation ''. American Journal of Roentgenology. 149 ( 5 ) : 1033 -- 42. PMID 3499774. doi : 10.2214 / ajr. 149.5. 1033. External links Atlas image : n1a8p6 at the University of Michigan Health System Image at Harvard University Diagram at csuchico.edu ( labeled as Massa intermedia ) `` Anatomy diagram : 13048.000 - 3 ''. Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2014 - 01 - 01. Anatomy of the diencephalon of the human brain Epithalamus Surface Pineal gland Habenula Habenular trigone Habenular commissure Grey matter Pretectal area Habenular nuclei Subcommissural organ Thalamus Surface Stria medullaris of thalamus Thalamic reticular nucleus Taenia thalami Grey matter / nuclei paired : AN Ventral VA / VL VP / VPM / VPL Lateral LD LP Pulvinar nuclei Metathalamus MG LG P cell M cell K cell midline : MD Intralaminar Centromedian Midline nuclear group Interthalamic adhesion White matter Mammillothalamic fasciculus Pallidothalamic tracts Ansa lenticularis Lenticular fasciculus Thalamic fasciculus PCML Medial lemniscus Trigeminal lemniscus Spinothalamic tract Lateral lemniscus Dentatothalamic tract Acoustic radiation Optic radiation Subthalamic fasciculus Anterior trigeminothalamic tract Medullary laminae Hypothalamus Surface Median eminence / Tuber cinereum Mammillary body Infundibulum Grey matter Autonomic zones Anterior ( parasympathetic / heat loss ) Posterior ( sympathetic / heat conservation ) Endocrine posterior pituitary : Paraventricular Magnocellular neurosecretory cell Parvocellular neurosecretory cell Supraoptic oxytocin / vasopressin other : Arcuate ( dopamine / GHRH ) Preoptic ( GnRH ) Suprachiasmatic ( melatonin ) Emotion Lateral Ventromedial Dorsomedial White matter afferent Medial forebrain bundle Retinohypothalamic tract efferent Mammillothalamic fasciculus Stria terminalis Dorsal longitudinal fasciculus Pituitary Posterior is diencephalon, but anterior is glandular Subthalamus Subthalamic nucleus Zona incerta Nuclei campi perizonalis ( Fields of Forel ) Retrieved from `` https://en.wikipedia.org/w/index.php?title=Interthalamic_adhesion&oldid=775038702 '' Categories : Wikipedia articles incorporating text from the 20th edition of Gray 's Anatomy ( 1918 ) Thalamus Hidden categories : Medicine infobox template using Dorlands parameter Talk About Wikipedia Italiano Polski Русский Edit links This page was last edited on 12 April 2017, at 07 : 48. 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Question: what is the intermediate mass of the brain
Answer: flattened band of tissue that connects both parts of the thalamus at their medial surfaces