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An integration center of the mormyrid fish brain the auricula cerebelli an horseradish peroxidase study


, : An integration center of the mormyrid fish brain the auricula cerebelli an horseradish peroxidase study. Neuroscience Letters 6(2-3): 115-120

The connections of a cerebellar structure, the eminentia granularis (e.gr.) in the mormyrid fish Gnathonemus petersii were demonstrated by the HRP method. Injections of horseradish peroxidase in this area and in several cranial nerves distinguished 2 regions in this extensive granular structure: the pars anterior (p.a.) which receives root fibers from the lateral line and vestibular nerves, and the pars posterior (p.p.) towards which converge afferent fibers from the spinal cord, the medulla oblongata and the mesencephalon. The former was considered as a primary center for specific sensory impulses and was called the eminentia granularis, sensu strictiori; in contrast the latter, which may be considered as the auricula, represented and integration center for secondary impulses arriving from the common (cutaneous, proprioceptive) sensory system.

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