Dilation of pupils. Division is activated as a unit . Preganglionic neurons originate in thoracic and lumbar regions of the spinal cord. Most ganglia lie near the spinal cord in the sympathetic chain . NE binds to adrenergic receptors on effector organs.
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 .