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Front 1

UNILATERAL HYPOGLOSSAL NERVE INJURY

Back 1

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

Front 2

LINGUAL NERVE

*shortly after branching from mandibular n.....

Back 2

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

Front 3

LINGUAL NERVE

SUBMANDIBULAR GANGLION

Back 3

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

Front 4

LINGUAL NERVE

SENSORY INNERVATION

Back 4

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

Front 5

HYPOGLOSSAL NERVE

Back 5

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

Front 6

GLOSSOPHARYNGEAL NERVE

*accompanies
*courses anteriorly,...
*types of innervation

Back 6

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

Front 7

GLOSSOPHARYNGEAL NERVE

cc: tonsillectomy

Back 7

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

Front 8

LINGUAL ARTERY

*arises from
*near what structures?

Back 8

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