Question

Which of the following describes a preganglionic fiber? A. It is a myelinated fiber. B. It...

Which of the following describes a preganglionic fiber?

A. It is a myelinated fiber.
B. It can be both myelinated and unmyelinated.
C. It terminates in a gland.
D. It terminates in a skeletal muscle.
E. It terminates in smooth or cardiac muscles only.
Science   Anatomy-And-Physiology   
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Answer #1

Answer

Option A) It is a myelinated fiber

  • A preganglionic fiber is always myelinated (contains myelin sheath) wether it is from symapthetic or parasymapthetic division of ANS.
  • Myelinated fibers contains nodes of Ranvier upon which the impulse jumps in order to reach the axon terminal.
  • Hence, the conduction of impulse is much faster in preganglionic fibers.
  • Also, all preganglionic fibers are cholinergic, means they release actylcholine as neurotransmitter.
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