Posted by Haley on November 26, 2014 at 10:42:58:
Can someone please confirm this is correct:
Anterior 2/3 of the tongue: Pain,temperature, and touch is by the lingual branch of the trigeminal nerve (CN V, mandibular division) and is GSA (general because pain is felt everywhere, somatic because it is derived from ectoderm, and afferent because it is sensory). Taste to the anterior 2/3 of the tongue is via the chords tympani branch of the facial n. (CN VII) and is SVA (special because taste is only in head/neck, I'm not sure why its visceral if it is also derived from ectoderm, afferent because it is sensory).
The posterior 1/3 of the tongue I am quite confused on. My understanding is that taste is via the glossopharyngeal nerve (CN IX) and is SVA. Pain, temperature, and touch is also via the glossopharyngeal nerve (CN IX) and is GVA (it is visceral now because it is derived from endoderm).
The most posterior part of the posterior tongue and the epiglottis have the same innervation. Pain, temperature, and touch is via glossopharyngeal nerve (CN IX) and is GVA. Taste to this region is via the vagus nerve (CN X) and is SVA.
The motor innervation to the entire tongue is via the hypoglossal nerve (CN XII).
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