Serotonergic projections from the ventral medulla to the intermediolateral cell column in the rat

Serotonergic neurons of the ventral medulla (B1 and B3 cell groups are retrogradely labeled after HRP injection in the T1-T2 levels of the spinal cord. Following stereotaxic injections of 3H-labeled amino acids in this region, a direct projection to th intermediolateral cell column and ventral horn can be demonstrated.