NCLEX Questions for Neurological System Related

Review NCLEX Questions for Neurological System related questions and content

Which type of fiber could be considered the longest?

  • A. preganglionic parasympathetic
  • B. preganglionic sympathetic
  • C. postganglionic parasympathetic
  • D. postganglionic sympathetic
Correct Answer: A

Rationale: The correct answer is A: preganglionic parasympathetic. Preganglionic fibers are the longest in the autonomic nervous system, with parasympathetic fibers generally having longer preganglionic fibers compared to sympathetic fibers. Parasympathetic preganglionic fibers originate from the cranial nerves and sacral spinal cord, allowing them to travel longer distances to reach their ganglia. In contrast, sympathetic preganglionic fibers originate from the thoracic and lumbar spinal cord, resulting in shorter lengths compared to parasympathetic fibers. Therefore, preganglionic parasympathetic fibers are considered the longest among the given choices. Postganglionic fibers, whether parasympathetic or sympathetic, are shorter as they only need to travel to their target organs from the ganglia.

Summary:
- A: Correct, as preganglionic parasympathetic fibers are the longest in the autonomic nervous system