Evidence for a sympathetic component in motor branches of the facial nerve: a horseradish peroxidase study in the cat.

The retrograde transport of horseradish peroxidase (HRP) was used to examine the location of sympathetic ganglion cells with axons in facial motor branches of the cat. Large numbers of HRP-labeled neurons were observed in the rostro-anterior part of the superior cervical ganglion. In addition, some labeled neurons were found in the cervical sympathetic trunk, the accessory cervical, middle cervical and stellate ganglia.