When piercing a peripheral nerve with a recording microelectrode, the structure encountered by the electrode after penetration of the connective tissue of the epineurium is the:
a. Endoneurium
b. Myelin sheath
c. Perineurium
d. Plasma membrane of an axon
e. Schwann cell nucleus
ANS: C
The perineurium forms a thin, discrete capsule around the bundles of axons that form a peripheral nerve. It encloses the endoneurium, the Schwann cells, and the axons themselves.
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