The entire nerve is surrounded by a tough fibrous sheath called the
A) endoneurium.
B) perineurium.
C) ectoneurium.
D) epineurium.

Question

Quizplus · Accepted Answer

The tough fibrous sheath that surrounds the entire nerve is called the epineurium. Choices A, B, and C refer to sheaths at different levels of nerve organization, but they do not surround the entire nerve. Endoneurium surrounds individual nerve fibers, perineurium surrounds bundles of nerve fibers (fascicles), and ectoneurium is not a recognized term in neuroanatomy.

The Entire Nerve Is Surrounded by a Tough Fibrous Sheath