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- W1992728848 abstract "The organization of the trochlear nucleus (N IV) was investigated in the frog Rana ridibunda. Retrograde tracing with horseradish peroxidase and biotinylated dextran amines resulted in labeling on the contralateral N IV of motoneurons with diverse morphologies and in direct caudal continuation with the oculomotor nucleus. Their dendritic arborizations extend profusely in the ipsilateral tegmentum and reach the oculomotor nucleus, the fasciculus longitudinalis medialis and also small processes branch towards the ventricle. Occasionally, one to three cells are labeled in the ipsilateral N IV, whereas mesencephalic trigeminal cells that would send their peripheral branch in the IVth nerve are never observed. The course of the labeled trochlear axons varies depending on the localization within the N IV of their cells of origin and different points of decussation are present above the midbrain ventricle. The ultrastructural analysis of identified trochlear motoneurons shows numerous axo-somatic synaptic contacts and six types of terminals with variable morphologies have been observed. Among them, a peculiar type of axon terminal forms mixed junctions with synaptic specializations and gap junctions together in the membrane interfaces that could represent the simultaneous presence of a chemical as well as an electrical component. The present data give more insights into the organization of the N IV and demonstrate that, although the organization of the trochlear nucleus is highly conservative in gnathostome vertebrates, it shows specific features for each species studied, as demonstrated for amphibians." @default.
- W1992728848 created "2016-06-24" @default.
- W1992728848 creator A5079941354 @default.
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- W1992728848 date "1995-01-01" @default.
- W1992728848 modified "2023-09-30" @default.
- W1992728848 title "The trochlear nucleus of the frog Rana ridibunda: Localization, morphology and ultrastructure of identified motoneurons" @default.
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- W1992728848 doi "https://doi.org/10.1016/0361-9230(94)00233-q" @default.
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