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8 Cards in this Set

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UNILATERAL HYPOGLOSSAL NERVE INJURY
5. Clinical note: following unilateral hypoglossal nerve injury, a protrud-
ing tongue deviates to the paralyzed side because of the unopposed action
of the functional genioglossus
LINGUAL NERVE

*shortly after branching from mandibular n.....
1. Lingual nerve

a. Shortly after branching from the mandibular nerve, the lingual nerve
is joined by the chorda tympani nerve; it then descends anteriorly
on the lateral surfaces of the medial pterygoid and hyoglossus
LINGUAL NERVE

SUBMANDIBULAR GANGLION
1. Lingual nerve

b. The submandibular ganglion is suspended from the lingual nerve op-
posite the third lower molar and receives preganglionic parasympa-
thetic fibers from the chorda tympani nerve; exiting postgangliomc
parasympathetic secretomotor fibers supply the adjacent subman-
dibular and sublingual glands
LINGUAL NERVE

SENSORY INNERVATION
1. Lingual nerve
c. The lingual nerve provides general sensory innervation to the ante-
rior two-thirds of the tongue; taste innervation for the anterior two-
thirds of the tongue is provided by the chorda tympani nerve
HYPOGLOSSAL NERVE
2. Hypoglossal nerve: courses anteriorly between the mylohyoid and hyo-
glossus; innervates all the muscles of the tongue, except palatoglossus,
which is innervated by the vagus nerve via the pharyngeal plexus
GLOSSOPHARYNGEAL NERVE

*accompanies
*courses anteriorly,...
*types of innervation
3. Glossopharyngeal nerve

a. Accompanies the stylopharyngeus through the gap in the lateral
pharyngeal wall between the superior and middle pharyngeal con-
strictors; courses anteriorly, between the palatine tonsil and hyo-
glossus, and provides general sensory and taste innervation to tlie
posterior one-third of the tongue
GLOSSOPHARYNGEAL NERVE

cc: tonsillectomy
3. Glossopharyngeal nerve
b. Clinical note: as the glossopharyngeal nerve courses deep to the
palatine tonsil, it is subject to injury during tonsillectomy; injury may
result in loss of general sensation and taste on the posterior one-third
of the tongue
LINGUAL ARTERY

*arises from
*near what structures?
1. Lingual artery

a. Arises from the external carotid artery posterior to the tip ot the greater cornu of the hyoid and courses anteriorly, deep to the hyo-
glossus