FACIAL WEAKNESS (FACIAL NERVE [VII])
Look for hemifacial weakness that includes muscles of forehead and orbicularis oculi (See Fig. 190-2). If lesion is in middle ear portion, taste is lost over the anterior two-thirds of tongue and there may be hyperacusis; if lesion is at internal auditory meatus, there may be involvement of auditory and vestibular nerves; pontine lesions usually affect abducens (sixth cranial) nerve and often corticospinal tract. Peripheral nerve lesions with incomplete recovery may produce continuous contractions of affected musculature (facial myokymia); contraction of all facial muscles on attempts to move one group selectively (synkinesis); hemifacial spasms; or anomalous tears when facial muscles activated as in eating (crocodile tears).
FIGURE 190-2
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Citation
Kasper, Dennis L., et al., editors. "FACIAL WEAKNESS (FACIAL NERVE [VII])." Harrison's Manual of Medicine, 20th ed., McGraw Hill Inc., 2020. harrisons.unboundmedicine.com/harrisons/view/Harrisons-Manual-of-Medicine/623663/all/FACIAL_WEAKNESS__FACIAL_NERVE_[VII]_.
FACIAL WEAKNESS (FACIAL NERVE [VII]). In: Kasper DLD, Fauci ASA, Hauser SLS, et al, eds. Harrison's Manual of Medicine. McGraw Hill Inc.; 2020. https://harrisons.unboundmedicine.com/harrisons/view/Harrisons-Manual-of-Medicine/623663/all/FACIAL_WEAKNESS__FACIAL_NERVE_[VII]_. Accessed January 21, 2025.
FACIAL WEAKNESS (FACIAL NERVE [VII]). (2020). In Kasper, D. L., Fauci, A. S., Hauser, S. L., Longo, D. L., Jameson, J. L., & Loscalzo, J. (Eds.), Harrison's Manual of Medicine (20th ed.). McGraw Hill Inc.. https://harrisons.unboundmedicine.com/harrisons/view/Harrisons-Manual-of-Medicine/623663/all/FACIAL_WEAKNESS__FACIAL_NERVE_[VII]_
FACIAL WEAKNESS (FACIAL NERVE [VII]) [Internet]. In: Kasper DLD, Fauci ASA, Hauser SLS, Longo DLD, Jameson JLJ, Loscalzo JJ, editors. Harrison's Manual of Medicine. McGraw Hill Inc.; 2020. [cited 2025 January 21]. Available from: https://harrisons.unboundmedicine.com/harrisons/view/Harrisons-Manual-of-Medicine/623663/all/FACIAL_WEAKNESS__FACIAL_NERVE_[VII]_.
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