Glossopharyngeal nerve

Question 1

nuclei of the Glossopharyngeal nerve

Answer 1

-ambiguous nucleus
-inferior salivary nucleus
-solitary tract nucleus
lateral ala cinerea nucleus
-spinal trigeminal nucleus

Question 2

location and function of ambiguous nucleus

Answer 2

• medulla

- SVM

Question 3

location and function of inferior salivary nucleus

Answer 3

• dorsal part of pons, above junction with medulla

- parasymp. preganglionic fibers GVM

Question 4

location and function of solitary tract nucleus

Answer 4

• medulla, elongated column deep in reticular formation

- sensation SVS

Question 5

location and function of lateral ala cinerea nucleus

Answer 5

• lower end of solitary tract

- GVS

Question 6

location and function of spindal trigeminal nucleus

Answer 6

• extends from principal nucleus down in to medulla until c1-c2 segment of spinal cord
• protopathis sensibility GSS

Question 7

brain exit of Glossopharyngeal nerve

Answer 7

lateral paraolivary sulcus superiorly

Question 8

Dura pentration of Glossopharyngeal nerve

Answer 8

jugular foramen (pars nervosa)

Question 9

skull exit

Answer 9

jugular foramen (pars nervosa)

Question 10

ganglia of Glossopharyngeal nerve

Answer 10

• superior (jugular) ggl

- inferior (petrosal, extracranial) ggl

Question 11

superior (jugular) ggl

Answer 11

smaller, upper on Glossopharyngeal nerve as it traverses the jugular foramen usually regarded as adetached part of the inferior ggl

Question 12

inferior (petrosal, extracranial) ggl

Answer 12

lower, more significant, sensory ggl on the Glossopharyngeal nerve immediately inferior to its exit from the jugular foramen

• pseudounipolar neurons comprising the ggl conveying taste and general sensation from the post. 1/3 of the tonuge and general sensation only from the
• fauces
• soft palate
• oropharynx

Question 13

INFO ABOUT THE SUP, INF GGL

Answer 13

the sup. inf. ggl in jugular foramen has its own sheath of dura matter.
the inf ggl on inf surface of petrous part of temporal is related with a triangular depression into which the aquaduct of chochlea opens
-inf. the Glossopharyngeal nerve is lat. and ant. to vagus nerve and accessory nerve

Question 14

what happens as it passes through the jugular foramen

Answer 14

passes between internal jugular vein and internal carotid artery

• descends in front of latteral vessel and beneath the styloid process and the muscle connected with it, to the lower border of the stylopharyngeus.
• curves forward forming an arch on the side of the next and lying upon the stylopharngues and middle pharyngeal constrictor muscle
• from there passes under cover of the hyoglosses muscle
• distributed to the
• palatine tonsil
• mucous membrane of the fauces
• base of tongue
• mucous glands of the mouth

Question 15

branches of the Glossopharyngeal nerve

Answer 15

• tympanic nerve of jacobson
• Arnolds nerve
• carotid branch (hering’s sinus nerve)
• pharyngeal plexus
• > pharyngeal branch
• > tonsillar branches
• > lingaul branches
• > motor branches for
• —->stylopharyngeus muscle
• —->superior contrictor of pharyns + upper 1/2 of middle constrictor of pharynx

Question 16

tympanic nerve of jacobson

Answer 16

from inferior ggl with somatosensory and preggl secretory fibers in the fossula petrosa

• runs through tympanic canaliculus into tympanic cavity
• recives fibers from sympatheitc plexus of carotid artery via the caroticotympanic nerve and forms the tympanic plexus
• supplies mucosa of tympanic cavity and auditory tube with sensory inn and only the secretory fibers continue running outside the cavity as the lesser petrosal nerve to the otic ggl

Question 17

Arnolds nerve

Answer 17

supplies somatosensory inn for the 1/3 of the tympanic membrance and external acoustic meatus (cell bodies in sup ggl, central process project to the spinal trigeminal tract)

Question 18

carotid branch (hering’s sinus nerve)

Answer 18

descends to the bifurcation of the commoncarotid arter to inn the baroreceptors in the wall of the carotid sinus and the chemorecepts in the carotid body (glomus)
-the impulses are transmitted to the lateral ala cinerea nucleus and via collaterals to the commissural nucleus of vagus to control heart rate and blood pressure (sinus reflex)

Question 19

pharyngeal plexus

Answer 19

mixed motor & sensory plexus of nerves formed by branches of the glossopharyngeal, vagus and indirectly: accessory nerves, canial roots
-lie along the post. wall of the pharynx

Question 20

pharyngeal branch

Answer 20

conveys general sensory fibers to the mucosa of the oropharynx via the pharyngeal plexus

Question 21

tonsillar branches

Answer 21

conducting sensory fibers from the palatine tonsillar fossa and soft palate

Question 22

lingual branches

Answer 22

conducts taste and somatosensory innervation for the posterior 1/3 of the tongue