Abstract
The topography of parvalbumin-immunoreactive neurons within the ventrolateral medulla of rats was investigated. Parvalbumin is a member of the ‘EF-hand’ family of Ca-binding proteins and is present in certain cell types within the central nervous system (fast-firing neurons with high metabolic rates). Parvalbumin-immunoreactive neurons were located in discrete rostrocaudal divisions of the ambiguus complex corresponding to regions containing respiratory-related neurons. Based on the location of physiologically characterized respiratory-related neurons reported in the literature, parvalbumin immunoreactivity does not appear to distinguish inspiratory- from expiratory-related neurons.
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