Final answer:
A motor neuron from the CNS in the ANS terminates in the sympathetic chain ganglia, adrenal medulla, or parasympathetic ganglia. For the sympathetic nervous system, it goes from the thoracolumbar spinal cord to a sympathetic ganglion, where it synapses onto a postganglionic neuron that reaches the target tissue.
Step-by-step explanation:
The motor neuron from the Central Nervous System (CNS) in the Autonomic Nervous System (ANS) typically terminates at the sympathetic chain ganglia, adrenal medulla, or parasympathetic ganglia, depending on the pathway. For the sympathetic nervous system, the preganglionic neuron, which is an extension from the lateral horn of the thoracolumbar spinal cord, synapses onto a postganglionic neuron within the sympathetic chain ganglia or a collateral location. The postganglionic neuron then extends to the target tissue, such as the sweat glands or blood vessels, to elicit a response.
The term that describes a bundle of axons in the peripheral nervous system (PNS) is a 'nerve'. The preganglionic fibers are part of the CNS and their axons travel through the cord to the spinal cord to synapse onto their targets. In the case of sympathetic pathways, they usually originate in the spinal cord and travel to the sympathetic ganglia. The target of an upper motor neuron is the lower motor neuron, which then connects to the skeletal muscle.