10 Questions
Where do the preganglionic neurons of the parasympathetic nervous system originate?
Nuclei of cranial nerves
Where are the sympathetic ganglia located?
Paravertebral chain
What is the adrenal medulla considered to be in relation to the sympathetic nervous system?
Specialized ganglion
Where are the parasympathetic ganglia located?
In or near the effector organs
Where do the preganglionic neurons of the sympathetic nervous system originate?
Spinal cord segments T1–L3
What is the primary neurotransmitter released at all preganglionic endings in both the sympathetic and parasympathetic nervous systems?
Acetylcholine
In which type of autonomic ganglia do the preganglionic fibers relay to the head, neck, thorax, and some abdominal viscera?
Paravertebral (lateral) ganglia
How many postganglionic neurons can a single sympathetic preganglionic fiber synapse with?
20 or more postganglionic neurons
Where are the sites of relay for preganglionic parasympathetic fibers located?
Terminal ganglia
What is the primary neurotransmitter secreted by chromaffin cells into the circulation?
Epinephrine
Test your knowledge about the organization of the autonomic nervous system and the two major groups of autonomic ganglia: sympathetic and parasympathetic. Explore the structure and function of preganglionic neurons and their role in autonomic ganglion.
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