Question

sympathetic preganglionic fibers are ______ and have ______ axons. long; unmyelinated short; myelinated long; myelinated intermediate; small short; unmyelinated

Explanation:

Sympathetic preganglionic fibers are relatively short in length compared to parasympathetic preganglionic fibers. Also, preganglionic fibers (both sympathetic and parasympathetic) are myelinated. Myelination helps in faster conduction of nerve impulses.

Answer:

short; myelinated