Central connections of the trigeminal motor command system in the weakly electric Elephantnose fish (Gnathonemus petersii )
| Autor: | Gerhard von der Emde, Monique Amey-Özel, Stefanie Anders, Kirsty Grant |
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| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Trigeminal Motor Nucleus Sensory system Reticular formation Efferent Pathways 03 medical and health sciences 0302 clinical medicine Interneurons Cerebellum medicine Animals Trigeminal Nerve Pretectal area Afferent Pathways Gnathonemus biology General Neuroscience Efference copy biology.organism_classification Neuroanatomical Tract-Tracing Techniques 030104 developmental biology medicine.anatomical_structure Trigeminal motor nucleus Raphe nuclei Nucleus Neuroscience 030217 neurology & neurosurgery Electric Fish |
| Zdroj: | Journal of Comparative Neurology. 527:2703-2729 |
| ISSN: | 1096-9861 0021-9967 |
| Popis: | The highly mobile chin appendage of Gnathonemus petersii, the Schnauzenorgan, is used to actively probe the environment and is known to be a fovea of the electrosensory system. It receives an important innervation from both the trigeminal sensory and motor systems. However, little is known about the premotor control pathways that coordinate the movements of the Schnauzenorgan, or about central pathways originating from the trigeminal motor nucleus. The present study focuses on the central connections of the trigeminal motor system to elucidate premotor centers controlling Schnauzenorgan movements, with particular interest in the possible connections between the electrosensory and trigeminal systems. Neurotracer injections into the trigeminal motor nucleus revealed bilateral, reciprocal connections between the two trigeminal motor nuclei and between the trigeminal sensory and motor nuclei by bilateral labeling of cells and terminals. Prominent afferent input to the trigeminal motor nucleus originates from the nucleus lateralis valvulae, the nucleus dorsalis mesencephali, the cerebellar corpus C1, the reticular formation, and the Raphe nuclei. Retrogradely labeled cells were also observed in the central pretectal nucleus, the dorsal anterior pretectal nucleus, the tectum, the ventroposterior nucleus of the torus semicircularis, the gustatory sensory and motor nuclei, and in the hypothalamus. Labeled terminals, but not cell bodies, were observed in the nucleus lateralis valvulae and the reticular formation. No direct connections were found between the electrosensory system and the V motor nucleus but the central connections identified would provide several multisynaptic pathways linking these two systems, including possible efference copy and corollary discharge mechanisms. |
| Databáze: | OpenAIRE |
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