the larger numbers of horseradish peroxidase-positive brainstem reticular neurons after tracer injections in intralaminar or zona incerta injections results from a more substantial proportion of labeled neurons in the central tegmental field at rostral midbrain ( perirubral ) levels and in the ventromedial part of the pontine reticular formation , ipsi- and contralaterally to the injection site .
C0006121
the
C0025462
midbrain