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Multiple Choice
Which connective tissue layer directly surrounds an individual axon in a peripheral nerve?
A
Perineurium
B
Epineurium
C
Endoneurium
D
Myelin sheath
Verified step by step guidance
1
Understand the structure of a peripheral nerve: Peripheral nerves are composed of multiple axons bundled together, and these axons are surrounded by specific connective tissue layers for protection and support.
Learn the hierarchy of connective tissue layers: The epineurium surrounds the entire nerve, the perineurium surrounds bundles of axons (fascicles), and the endoneurium surrounds individual axons.
Focus on the endoneurium: The endoneurium is a delicate connective tissue layer that directly surrounds each individual axon within a peripheral nerve. It provides structural support and helps maintain the environment necessary for nerve function.
Differentiate the myelin sheath: The myelin sheath is not a connective tissue layer but rather a fatty insulating layer produced by Schwann cells that wraps around the axon to enhance signal transmission.
Conclude the correct answer: Based on the hierarchy and function of connective tissue layers, the endoneurium is the layer that directly surrounds an individual axon in a peripheral nerve.