Abstract
Following iontophoretic injections of the retrograde tracer Fluoro-gold into the rat locus coeruleus (LC), retrogradely labeled neurons were seen predominantly in the area of C1 adrenergic neurons in the ventrolateral medulla (nucleus paragigantocellularis; PGi) and in the area of C3 adrenergic neurons in the dorsomedial medulla (nucleus prepositus hypoglossi; PrH). Subsequent immunofluorescence for phenylethanolamine- N-methytransferase indicated that adrenergic and non-adrenergic LC projecting neurons in both areas are interdigitated, and that 21% of LC afferent neurons in the PGi are adrenergic while only 4% of LC afferent neurons in the area of PrH are adrenergic.
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