The cardiac plexus, which contains parasympathetic ganglia, plays an important role in regulating cardiac function.

TACL-peptide was demonstrated to localize in parasympathetic ganglia neurons in addition to neuronal structures in the hindbrain and spinal cord.

Muscarinic M-1 receptors, whose stimulation is associated with enhancement of acetylcholine release, may also be located in the airway parasympathetic ganglia.