intralaminar thalamic nuclei intralaminar thalamic nuclei the intralaminar thalamic nuclei (itn) are collections of neurons in the internal medullary lamina of the thalamus that are generally divided in two groups as follows: anterior (rostral) group central medial nucleus paracentral nucleus central lateral nucleus posterior (caudal) intralaminar group centromedian nucleus parafascicular nucleus intralaminar nuclei of thalamusthalamic nucleidetailspart ofthalamusidentifierslatinnuclei intralaminares thalamiacronym(s)itnmeshd020646neuronames317neurolex idbirnlex_1530ta98a14.1.08.615ta25685fma62021anatomical terms of neuroanatomy some sources also include a "central dorsal" nucleus. degeneration of this area can be associated with progressive supranuclear palsy and parkinson's disease. additionally, infarction of the thalamic paramedian artery may result in varied features such as disorientation, confusion, hypersomnolence, deep coma, or akinetic mutism. this area is also prominently affected in traumatic brain injuries. one postmortem study of patients with closed head injuries showed correlation of the involvement of these nuclei with the various degrees of disability.