The pigmented subpeduncular nucleus: a neuromelanin-containing nucleus in the human pontine tegmentum. Morphology and changes in Alzheimer's disease.
A nuclear gray is found in the human pontine tegmentum close to the lower circumference of the superior cerebellar peduncle and is located within the pedunculo-lemniscal trigone. It is mainly characterized by the presence of medium-sized neuro-melanin-containing neurons and, therefore, referred to as the pigmented subpeduncular nucleus. Three basic neuronal types occur within the boundaries of the nucleus. Scattered among the neuromelanin-containing type I nerve cells are type II cells with lipofuscin deposits and type III neurons devoid of any pigmentation. In cases of Alzheimer-type dementia, the pigmented subpeduncular nucleus shows severe changes. Neurofibrillary tangles can frequently be found within the somata of both the melanin-laden and the lipofuscin-containing neurons. In contrast, the non-pigmented nerve cells remain devoid of such pathological filaments. Furthermore, large numbers of neuropil threads are scattered throughout the nuclear gray.
Ohm
T G
TG
J.W. Goethe-Universität, Zentrum der Morphologie, Frankfurt/Main, Federal Republic of Germany.
Braak
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D000544:Alzheimer Disease / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D008062:Lipofuscin / Q000378:metabolism; D008543:Melanins / Q000378:metabolism*; D008875:Middle Aged; D009454:Neurofibrils / Q000378:metabolism / Q000473:pathology*; D011149:Pons / Q000378:metabolism / Q000473:pathology*
D008062:Lipofuscin; D008543:Melanins; C014121:neuromelanin