Anatomy & Histology · single question
In the bulimia case — which cranial nerve is affected by the erosion pattern (taste in the anterior 2/3 of the tongue)?
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Correct answer: B. CN VII (Facial)
✓ B) CN VII (Facial nerve) is correct.
Taste sensation for the anterior 2/3 of the tongue is carried by the chorda tympani branch of CN VII (facial nerve). The lingual nerve (branch of CN V3) provides general somatic sensation (touch, pain, temperature) to the anterior 2/3 of the tongue, but NOT taste. Taste for the posterior 1/3 = CN IX (glossopharyngeal). CN VII damage (Bell's palsy) causes ipsilateral loss of taste in the anterior 2/3 of the tongue in addition to facial muscle paralysis.
Taste sensation for the anterior 2/3 of the tongue is carried by the chorda tympani branch of CN VII (facial nerve). The lingual nerve (branch of CN V3) provides general somatic sensation (touch, pain, temperature) to the anterior 2/3 of the tongue, but NOT taste. Taste for the posterior 1/3 = CN IX (glossopharyngeal). CN VII damage (Bell's palsy) causes ipsilateral loss of taste in the anterior 2/3 of the tongue in addition to facial muscle paralysis.
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