Which connective tissue layer surrounds individual nerve fibers within a peripheral nerve?

Which connective tissue layer surrounds individual nerve fibers within a peripheral nerve?

• A. Endoneurium
• B. Perineurium
• C. Epineurium
• D. Dura

Answer: (A)

In peripheral nerves, each individual nerve fiber is wrapped by the endoneurium, a thin connective tissue layer that surrounds the axon and its myelin sheath, providing a protected microenvironment and housing capillaries. The perineurium surrounds a group of fibers called a fascicle, and the epineurium covers the whole nerve. The dura is a meningeal layer around the brain and spinal cord, not part of a peripheral nerve. So, the layer around each nerve fiber is the endoneurium.

In peripheral nerves, each individual nerve fiber is wrapped by the endoneurium, a thin connective tissue layer that surrounds the axon and its myelin sheath, providing a protected microenvironment and housing capillaries. The perineurium surrounds a group of fibers called a fascicle, and the epineurium covers the whole nerve. The dura is a meningeal layer around the brain and spinal cord, not part of a peripheral nerve. So, the layer around each nerve fiber is the endoneurium.