In terms of neuron structure, what characterizes postganglionic fibers in the sympathetic division?
Understand the Problem
The question is asking about the characteristics of postganglionic fibers in the sympathetic division of the nervous system, specifically focusing on their length and myelination.
Answer
Long, unmyelinated, and adrenergic (release norepinephrine).
Postganglionic fibers in the sympathetic division are characterized by being long and unmyelinated, as they bridge the distance between the ganglion and the target effector. These fibers typically release norepinephrine and are considered adrenergic.
Answer for screen readers
Postganglionic fibers in the sympathetic division are characterized by being long and unmyelinated, as they bridge the distance between the ganglion and the target effector. These fibers typically release norepinephrine and are considered adrenergic.
More Information
Postganglionic fibers in the sympathetic division extend to various organs to elicit responses like increased heart rate and energy mobilization. The long, unmyelinated nature allows these fibers to effectively reach organs situated further from the spine.
Tips
A common mistake is to assume all postganglionic fibers are myelinated. Within the sympathetic division, they are typically unmyelinated. Additionally, it's important to distinguish them from preganglionic fibers which are myelinated.
Sources
- Physiology, Autonomic Nervous System - StatPearls - NCBI Bookshelf - ncbi.nlm.nih.gov
- Postganglionic Nerve - an overview | ScienceDirect Topics - sciencedirect.com
- 14.2C: Postganglionic Neurons - Medicine LibreTexts - med.libretexts.org
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