_Clinical Features._--Three types of lesion result from indirect
violence: the whole plexus; the upper-arm type; and the lower-arm type.
_When the whole plexus is involved_, sensibility is lost over the entire
forearm and hand and over the lateral surface of the arm in its distal
two-thirds. All the muscles of the arm, forearm, and hand are paralysed,
and, as a rule, also the pectorals and spinati, but the rhomboids and
serratus anterior escape. There is paralysis of the sympathetic fibres
to the eye and orbit, with narrowing of the palpebral fissure, recession
of the globe, and the pupil is slow to dilate when shaded from the
light.
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