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KMID : 0374019820050030117
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Ewha Medical Journal
1982 Volume.5 No. 3 p.117 ~ p.124
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An Electron Microscopic Study of the Synapses of the Locus Coeruleus in the Squirrel Monkey, Saimiri sciureus
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Abstract
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This study provides a description of the normal morphology of the synapses of the locus coeruleus in the squirrel monkey, Saimiri sciureus, at the electron microscopic level. The animals were perfused with 2% glutaraldehy-´de -1% paraformaldehyde fixative in phosphate buffer at pH 7.4
Tissues from the locus coeruleus were postfixed by 2 % osmium tetroxide in phosphate buffer at pH 7.4, and dehydrated in graded ethanol and aceton, and embedded in Epon 812, The, polymerization was carried out in oven at 60C. The ultrathin sections were cut on a LKB ultratome, contrasted with uranyl acetate and lead citrate, and examined in a Siemens Elmiskop 1A el ectron microscope. Special attention during the observation was given to the different types of synapses. Five types of synapses with many characteristics, could be differentiated : small-round vesicle terminals (52 % ), pleomorphic vesicle terminals(25%), elongated vesicle terminals(16%), small-round and dense core vesicle terminals (5%) and -large-round vesicle terminals (2%). Some of the axosomatic synapses with small round or pleomorphic vesicles make an indirect contact to the soma by somatic `appendages.
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