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Projections to the pontine nuclei from choline acetyltransferase‐like immunoreactive neurons in the brainstem of the cat

By use of retrograde transport of horseradish peroxidase‐wheat germ agglutinin (HRP‐WGA) in combination with monoclonal antibodies against choline acetyltransferase (ChAT), we show that putative cholinergic inputs to the feline pontine nuclei originate from cells in the dorsolateral pontine tegmentum. These cells form a loosely arranged continuum that nevertheless may be subdivided into two groups on the basis of differences in cell morphology. One group consists of double‐labeled cells in the periventricular gray substance medial to, and partly merging with, the nucleus locus coeruleus. The other group consists of double‐labeled cells surrounding the brachium conjunctivum. In two cats with tracer injections in the pontine nuclei, 81% and 84%, respectively, of the retrogradely labeled cells in the dorsolateral pontine tegmentum are ChAT‐like immunoreactive (ChAT‐LI). In the same experiments, many ChAT‐LI cells, but no retrogradely labeled cells, are seen in the basal telencephalon.