characteristics of a peripheral facial paralysis ( seen on the affected side) include: (1)
unable to wrinkle forehead
unable to raise eyebrow
unable to wrinkle nasolabial fold
unable to purse lips or show teeth
inability to completely close eye
lacrimation, salivation and taste is likely to be impaired when the lesion is proximal or involving the geniculate ganglion (2)
when the lesion is distal to the internal auditory canal and geniculate ganglion lacrimation is intact but, salivation and taste is likely to be impaired (2)
decreased taste - indicates a lesion above origin of the chorda tympani
hyperacusis -indicates the lesion is above nerve to stapedius
reduction of lacrimation - indicates the lesion is above the geniculate ganglion
Bell phenomenon
on closing the affected eye there is visible vertical rotation of the globe
characteristics of a central facial paralysis include: (1)
movements of the frontal and upper orbicularis oculi muscles tend to be spared since there are uncrossed contributions from ipsilateral supranuclear areas
during emotional expression facial movement may be present on affected side
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