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Mitral cell differentiation and synaptogenesis of rat presumptive olfactory bulb in organ culture

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Summary

The ultrastructure of differentiating rat presumptive olfactory bulb in organ culture was investigated with particular reference to mitral cell differentiation and formation of synapses. The presumptive olfactory bulb and olfactory mucosa were dissected en bloc from rat embryos on the fifteenth day of gestation and cultured for 7 days, after which the expiants were examined by electron microscopy. The presumptive olfactory bulb had differentiated into a laminated structure with layers corresponding to the glomerular, external plexiform and mitral cell layers. Mitral-like cells were identified by their location and large cell size. Ultrastructural observations indicated that they were relatively well-differentiated. Their dendrites extended into the glomerular layer in which they were postsynaptic to incoming olfactory axons. The distal part of these dendrites frequently contained coated vesicles. Both asymmetrical and symmetrical synapses were found. The symmetrical synapses involved dendrodendritic contacts between periglomerular cells. Synapses in reciprocal arrangements were not observed in the organ cultures.

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Authors and Affiliations

  1. Department of Anatomy, Chinese University of Hong Kong, Hong Kong

    M. I. Chuah & A. I. Farbman

  2. Department of Neurobiology and Physiology, Northwestern University, Evanston, USA

    M. I. Chuah & A. I. Farbman

Authors
  1. M. I. Chuah
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  2. A. I. Farbman
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Chuah, M.I., Farbman, A.I. Mitral cell differentiation and synaptogenesis of rat presumptive olfactory bulb in organ culture. Cell Tissue Res. 243, 359–365 (1986). https://doi.org/10.1007/BF00251052

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  • DOI: https://doi.org/10.1007/BF00251052

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