Final answer:
The preganglionic fibers of the ANS sympathetic division originate in the thoracolumbar spinal cord.
Step-by-step explanation:
The preganglionic fibers of the ANS sympathetic division originate in the thoracolumbar spinal cord.
These fibers release ACh, which excites the ganglionic neuron through the nicotinic receptor.
The postganglionic fiber then projects to a target effector and releases norepinephrine to bind to an adrenergic receptor, causing a change in the physiology of that organ.