Ultrastructural observations on beaded α‐motoneuron dendrites
- 1 January 1987
- journal article
- research article
- Published by Wiley in Acta Physiologica Scandinavica
- Vol. 129 (1) , 61-66
- https://doi.org/10.1111/j.1748-1716.1987.tb08040.x
Abstract
Beaded dendrites of 1α‐motoneurons intracellularly labelled with horseradish peroxidase (HRP) were studied ultrastructurally in eight adult cats. For comparison, adjacent unlabelled beaded dendrites of unknown origin were also included in the study. Electron microscopy revealed no signs of degeneration or poor fixation according to common criteria. With the exception of the HRP‐reaction product no difference in structure was observed between labelled and unlabelled beaded dendrites. Both the beads and their interconnecting segments were postsynaptic to boutons of normal appearance containing spherical (S‐type boutons) or flattened vesicles (F‐type boutons). The values for synaptic covering and synaptic packing density of the beaded dendritic regions, which usually were located in the periphery of the dendritic trees, were clearly lower than values obtained previously for cell bodies and proximal dendrites of a‐motoneurons.Keywords
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