X-ray microanalysis of monoaminergic terminals in the nucleus tegmentalis dorsalis of the chicken.
X-ray microanalysis after aldehyde-chromate-dichromate treatment served to confirm the presence of monoaminergic terminals in the nucleus tegmentalis dorsalis (NTD) of the chicken. The monoaminergic terminals were represented as neuronal elements with electron-dense vesicles (EDVs) of several different shapes as seen in Eponembedded semi-thin sections. Conventional electron microscopic observations of the adjacent ultra-thin sections showed the EDVs to be comprised of spherical medium-sized (about 80 nm in diameter), large dense-cored (about 120 nm) and elongated granular vesicles (100-220 nm) in the same nerve varicosities. It is probable that the NTD, being a center of catecholaminergic efferent projections, may also receive direct monoaminergic inputs from an unknown area of the brain and/or from recurrent collaterals of the same catecholamine-containing neurons in the NTD.
D000818:Animals; D001679:Biogenic Amines / Q000502:physiology*; D002645:Chickens / Q000033:anatomy & histology*; D004577:Electron Probe Microanalysis; D005260:Female; D008297:Male; D009411:Nerve Endings / Q000648:ultrastructure*; D013681:Tegmentum Mesencephali / Q000648:ultrastructure*
D001679:Biogenic Amines