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Mixed nerve somatosensory
evoked potentials test both sensory and
motor nerve fibers in the peripheral nervous
system to the spinal cord. In an upper profile
(cervical and extremities), the pure sensory
nerves and myelin sheath which ascend to
the sensory cortex in the central nervous
system can be tested by means of interpeak
measurements. This test determines if there
are any demyelinating lesions in the peripheral
nerves. Brachial plexus or central nervous
system medial, ulnar, and radial nerves
can be tested with this procedure. The lower
profile (lumbar and extremities) SSEP usually
studies the posterior tibial nerve.
SSEPs aid in the evaluation
of:
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