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Ultrastructural features of six types of neurons in rat dorsal root ganglia

  • Published:
Journal of Neurocytology

Summary

Sections of glutaraldehyde-fixed lumbar dorsal root ganglia of the rat were examined in the electron microscope following impregnation with the uranyl-lead-copper technique or postfixation in potassium ferrocyanide-reduced osmium. Three types of ganglion cells (A, B, C) were identified on the basis of their size and the distribution of their organelles. They were further subdivided into six subtypes according to the arrangement and three-dimensional organization of the Nissl bodies and Golgi apparatus in the perikarya. Type A1 cells were large, clear neurons in which Nissl bodies, separated from each other by pale narrow strands of cytoplasm containing small stacks of Golgi saccules and rod-like mitochondria, were evenly distributed throughout the perikaryon. In type A2, the Nissl bodies assumed a similar distribution but were separated by much wider strands of cytoplasm. Type A3, the smallest of the type A category, displayed densely packed Nissl bodies and long stacks of Golgi saccules which formed a perinuclear ring in the mid-portion of the perikaryon.

Type B cells were smaller and showed a concentric zonation of their organelles. In type B1, large Nissl bodies located in an outer cytoplasmic zone were made of long piles of parallel cisternae interrupted by curved Golgi stacks. Type B2 was characterized by a ring-like Golgi apparatus separating the perikaryon in a cortical zone composed mainly of Nissl substance and a juxtanuclear zone containing mitochondria and smooth endoplasmic reticulum. Type C cells were the smallest of the ganglion cells and contained small, poorly demarcated Nissl bodies and a juxtanuclear Golgi apparatus.

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Authors and Affiliations

  1. Département de Biologie, Centre d'Etudes Nucléaires de Saclay, Gif-sur-Yvette, France

    A. Rambourg

  2. Department of Anatomy, McGill University, H3A 2B2, Montreal, Quebec, Canada

    Y. Clermont

  3. Montreal Neurological Institute, H3A 2B4, Montreal, Quebec, Canada

    A. Beaudet

Authors
  1. A. Rambourg
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  2. Y. Clermont
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  3. A. Beaudet
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Rambourg, A., Clermont, Y. & Beaudet, A. Ultrastructural features of six types of neurons in rat dorsal root ganglia. J Neurocytol 12, 47–66 (1983). https://doi.org/10.1007/BF01148087

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  • DOI: https://doi.org/10.1007/BF01148087

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