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Bilateral ventral pons lesions (iscemic
or hemorrhagic) may result in this deefferented
state, with preserved consciousness and
sensation, but paralysis of all movements
except vertical gaze and eyelid opening.
1. Quadriplegia due to bilateral corticospinal
tract involvement
2. Aphonia due to corticobulbar tract involvement
to lower cranial nerve nuclei
3. Occasionally, impairment of horizontal
eye movements due to bilateral involvement
of the fasciclesof cranial nerve
4. Reticular formation is spared, so the
patient is typically fully awake. The supranuclear
ocular motor pathways lie dorsally, so that
vertical eye movements and blinking are
intact.
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