Walter B. Cannon - American physiology, 1st half 20th cent. Cause muscles to constrict or relax 3. Most organs receive nerves from both - dual innervation b. All autonomic fibers synapse before reaching target organ 1. Final neurons lie outside the CNS in ganglia 2.
Parasympathetic ganglia are on the target organ c.
Postganglionic transmitter 1. Parasympathetic - acetylcholine, different type of receptor than preganglionic 6. Below thalamus, above and behind the optic chiasma with the pituitary below 3. Periventricular zone - adjacent 3rd ventricle, monitor internal states, e.g., temperature, salt concentration, hormone levels 2. Medial zone - regulates endocrine glands via the pituitary 3.