oral cavity and upper GI tract Flashcards
tongue: describe the anatomy, motor and sensory innervation and role of the intrinsic and extrinsic muscles
4 muscles of tongue
styloglossus, hyoglossus, genioglossus, intrinsic muscles
innervation of tongue
XII
function of styloglossus
retracts tongue to move bolus of food into oropharynx
what else is hyoglossus attached to
hyoid bone
what else is genioglossus attached to
mandible
function of hyoglossus, and hence testing for CN XII
protrudes tongue, so ask patient to stick tongue out and check for deviation (if one side is damaged, tongue protrudes towards lesion)
2 nerves running under tongue
hypoglossal, lingual
what cranial nerve is the lingual nerve a branch of
mandibular division of trigeminal (V3)
what does the lingual nerve supply the tongue with
touch sensation and taste perception
what ganglion sits below tongue
submandibular ganglion
what nerve supplies anterior 2/3 of tongue with sensation
mandibular division of trigeminal (V3)
what nerve supplies anterior 2/3 of tongue with taste perception
facial nerve (VII)
where do all taste fibres go back to
nucleus solitarius in brainstem
what nerve supplies posterior 1/3 of tongue with sensation and taste
glossopharyngeal (IX) (and some by vagus (X))
