Question

sympathetic preganglionic fibers are ________ and have ________ axons.

short; myelinated

long; unmyelinated

short; unmyelinated

intermediate; small

long; myelinated

Explanation:

Sympathetic preganglionic fibers originate in the thoracic and lumbar regions of the spinal cord. They are relatively short in length compared to parasympathetic preganglionic fibers. Also, preganglionic fibers (both sympathetic and parasympathetic) are myelinated. Myelination speeds up the conduction of nerve impulses.

Answer:

A. short; myelinated