Computational Intelligence in Analysis of Electromyography Signals - Computational Intelligence in Biomedical Engineering - page 225

Common peroneal
nerve

Deep peroneal nerve

Tibialis anterior

Superficial peroneal
nerve

Extensor digitorum longus

Extensor hallucis longus

Peroneus tertius

Extensor digitorum brevis

Cutaneous
distribution

Dorsal digital cutaneous nerve

FIGURE 5.13
The peroneal nerve anatomy showing the nerve branches into the calf, feet,
and toes. (Reprinted with permission from Preston, D. and Shapiro, B., Elec-
tromyography and Neuromuscular Disorders: Clinical-Electrophysiologic Cor-
relations , Elsevier, Philadelphia, PA, 2005.)

is present in one or more branches of the trigeminal nerve and can be triggered
by a light touch or brushing of the facial skin causing acute pain.
Although mononeuropathies are the result of injury to a single nerve, poly-
neuropathies arise from disorders in a nerve bundle or a whole group of
peripheral nerves. Despite several etiological symptoms, polyneuropathies are
similar due to the limited manner in which sensory nerves can react to mal-
function. There are several distinct disorders that include variants of chronic
inflammatory demyelinating polyneuropathy and acute inflammatory demyeli-
nating polyneuropathy (AIDP) characterized by sudden onset. Examination
of the nerve fibers involved and the fiber size can help pinpoint the eti-
ology; however, EMG is of limited usefulness because patients with pure
small fiber polyneuropathy have normal electrophysiological characteristics.