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Effects of noradrenaline applied iontophoretically on rat superior collicular neurons.

Authors
Type
Published Article
Journal
Brain Research Bulletin
0361-9230
Publisher
Elsevier
Publication Date
Volume
10
Issue
4
Pages
453–457
Identifiers
PMID: 6860974
Source
Medline
License
Unknown

Abstract

In rats anesthetized with urethane effects of iontophoretically applied noradrenaline (ejection currents, less than 20 nA) were examined on spontaneous and/or photically evoked discharges of neurons in the superior colliculus (SC). In a given SC neuron NA acted either to facilitate or to inhibit both spontaneous and evoked discharges. Though the inhibition was more frequently observed than the facilitation in all layers of the SC, the ratio of the facilitated neurons to the inhibited ones increased as one advanced through the SC from superficial to deep. These findings are in line with those obtained when SC neurons were subject to repetitive electrical stimulation of the locus coeruleus.

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