Adrenal medulla is innervated by sympathetic preganglionic neurons. Secretes epinephrine in response to sympathetic stimulation. Constriction of pupils. Individual organs are controlled separately . Preganglionic neurons originate in brainstem or sacral spinal cord .
Most ganglia lie in or near effector organs .
ACh binds to cholinergic receptors on effector organs. Most organs are innervated by both sympathetic and parasympathetic neurons. The two divisions usually produce opposite effects.