Two neurons make-up the system:

• Two neurons make-up the system:

• First neuron is in the brainstem or sacral cord.
• Second neuron is in a cranial ganglion or in the innervated organ wall.

• Cranial 3, 7, 9, 10, or Sacral nerves 2-4

• Constrict the pupil, 3th
• Saliva production 7, 9th
• Nasal mucosa 7th
• Slow the heart 10th
• Constrict the bronchi 10th
• Increase gut secretion & motility 10th
• Enhance genital function Sacral
• Bladder and rectal control Sacral