The human premotor oculomotor brainstem system - can it help to understand oculomotor symptoms in Huntington's disease?
Recent progress in oculomotor research has enabled new insights into the functional neuroanatomy of the human premotor oculomotor brainstem network. In the present review, we provide an overview of its functional neuroanatomy and summarize the broad range of oculomotor dysfunctions that may occur in Huntington's disease (HD) patients. Although some of these oculomotor symptoms point to an involvement of the premotor oculomotor brainstem network in HD, no systematic analysis of this functional system has yet been performed in brains of HD patients. Therefore, its exact contribution to oculomotor symptoms in HD remains unclear. A possible strategy to clarify this issue is the use of unconventional 100-microm-thick serial tissue sections stained for Nissl substance and lipofuscin pigment (Nissl-pigment stain according to Braak). This technique makes it possible to identify the known nuclei of the premotor oculomotor brainstem network and to study their possible involvement in the neurodegenerative process. Studies applying this morphological approach and using the current knowledge regarding the functional neuroanatomy of this human premotor oculomotor brainstem network will help to elucidate the anatomical basis of the large spectrum of oculomotor dysfunctions that are observed in HD patients. This knowledge may aid clinicians in the diagnosis and monitoring of the disease.
Rüb
U
U
Institute of Clinical Neuroanatomy, J. W. Goethe University, Frankfurt/Main, Germany. drueb@gmx.de
Heinsen
H
H
Brunt
E R
ER
Landwehrmeyer
B
B
Den Dunnen
W F A
WF
Gierga
K
K
Deller
T
T
D001933:Brain Stem / Q000473:pathology / Q000502:physiology* / Q000503:physiopathology*; D005133:Eye Movements / Q000502:physiology*; D005625:Frontal Lobe / Q000473:pathology / Q000503:physiopathology*; D006801:Humans; D006816:Huntington Disease / Q000473:pathology / Q000503:physiopathology*; D009434:Neural Pathways / Q000473:pathology / Q000503:physiopathology*; D015348:Vision, Binocular