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• W1971932337 abstract "The geometrical differences between individual dendrites of a given motoneuron were investigated in the cat. We chose two brain-stem motoneurons involved in different motor activities. One abducens and one laryngeal motoneuron were selected from two series of experiments which had combined intracellular recording and horseradish peroxidase staining. Three-dimensional reconstructions were made using a computer-aided microscope to obtain high-resolution measurements from serial histological sections. Each dendrite was characterized by computer dissection. Comparisons between dendrites were made on the basis of the following parameters: spatial projections, length, diameters, tapering, branching pattern, daughter-branch ratio and branching power. The present findings show that each dendrite projects to specific terminal fields for both motoneurons and are different in the complexity of their geometry and branching structure. The consequences of this complexity for the cable properties of the motoneurons were analysed. The dendrites of the two motoneurons were partitioned into a series of contiguous regions deemed short enough to be considered an isopotential cylinder and the steady-state properties were calculated for each segment. The properties of each segment were then combined for each dendrite for the following parameters: electronic distance, somatopetal and somatofugal voltage attenuation, input resistance and charge transfer effectiveness ratio. The present results show significant differences in the electrical behaviour of individual dendrites. Branch-to-branch computation reveals low attenuation pathways between branches suggesting the possibility of local influences within the distal branches of the dendritic arborization. It is proposed that the individual dendrites of the motoneuron function as distinct channels and/or integrators for afferent inputs." @default.
• W1971932337 created "2016-06-24" @default.
• W1971932337 creator A5008050888 @default.
• W1971932337 creator A5029433260 @default.
• W1971932337 creator A5050460253 @default.
• W1971932337 date "1987-09-01" @default.
• W1971932337 modified "2023-10-15" @default.
• W1971932337 title "The dendrites of single brain-stem motoneurons intracellularly labelled with horseradish peroxidase in the cat. Morphological and electrical differences" @default.
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• W1971932337 doi "https://doi.org/10.1016/0306-4522(87)92972-1" @default.
• W1971932337 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/3683857" @default.
• W1971932337 hasPublicationYear "1987" @default.
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