Abstract
Locus coeruleus terminals in intraocularly transplanted spinal cords and catecholamine terminals in defined areas of normal spinal cords were investigated qualitatively and quantitatively by immunoelectron microscopy. Results showed that the morphological features of synapses formed in the grafts closely resembled those of normal spinal cords. The incidences of synapses per varicosities, as observed in single sections, were 30.1, 40.2 and 22.8% for the ventral horn, dorsal horn and grafted spinal cord, respectively. In all three groups, most of the postsynaptic targets were small dendrites, although high frequencies of large dendrites were found in the ventral horn. Spines and axons in the grafts were also postsynaptic targets. Several characteristics of relative immaturity were observed in the grafts. It is suggested that the inhibition of spinal neurons by locus coeruleus terminals may be mediated not only by volume transmission through nonsynaptic contacts, but also by direct contacts with catecholamine terminals, and that the excitation of facilitation observed at those terminals may be explained by the suppression of inhibitory neurons by axoaxonic contacts.
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Inoue, H.K., Henschen, A., Nagatsu, I. et al. Locus coeruleus terminals in intraocularly transplanted spinal cords as compared with catecholamine terminals in normal spinal cords: Their synaptic densities and functional considerations. Med Electron Microsc 27, 123–135 (1994). https://doi.org/10.1007/BF02348177
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DOI: https://doi.org/10.1007/BF02348177