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- W2000921245 abstract "The study was performed on adult mongrel cats to investigate synaptic structures of nerve terminals in the dorso-medial portion of the nucleus tractus solitarius (NTS), where majorities of the cardiovascular afferent fibers terminate and a dense plexus of the catecholaminergic nerves exists. In normal control groups, axo-dendritic and axo-somatic contacts were commonly observed but no axo-axonic contacts were seen. Synaptic vesicles were almost exclusively spherical (97%) and less frequently flat (3%). Small cored vesicles were not observed in animals with formalin-glutaraldehyde and osmium tetroxide fixation. Two or three days after denervation of IXth and Xth cranial nerves, degenerated axon varicosities occupied about 15-20% of total population. Quantitative analysis after intracisternal injection of 5-hydroxydopamine revealed 3 different types of the varicosity: varicosities with spherical clear vesicles (85%), flat clear vesicles (3%) and small cored vesicles (12%). Axon varicosities with small cored vesicles predominantly exhibited axo-dendritic synapses and occasionally showed the closed apposition with those containing spherical clear vesicles. 6-Hydroxydopamine produced a minimal degree of degenerative changes in some axon varicosities (less than 5%). Treatment with 5-hydroxydopamine after IXth and Xth cranial nerve section gave intact axon varicosities with small cored vesicles. In conclusion, there is a relatively dense innervation of catecholaminergic nerves in the dorso-medial portion of the NTS, which apparently does not stem from the IXth and Xth cranial nerves. Possible roles of catecholaminergic nerves are discussed." @default.
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- W2000921245 date "1975-01-01" @default.
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- W2000921245 title "The synaptic structure of catecholaminergic axon varicosities in the dorso-medial portion of the nucleus tractus solitarius of the cat: Possible roles in the regulation of cardiovascular reflexes" @default.
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- W2000921245 doi "https://doi.org/10.1016/0006-8993(75)90798-2" @default.
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