Glossopharyngeal Nerve

Question 1

Glossopharyngeal nerve

Answer 1

9th cranial nerve

Question 2

Origin

Answer 2

A mixed nerve arising from medulla by 4 nuclei:
1. Motor
2. 2 sensory
3. Parasympathetic

Question 3

Motor

Answer 3

Nucleus ambiguous

Question 4

Parasympathetic

Answer 4

Inferior salivary

Question 5

2 sensory

Answer 5

1. Nucleus solitaries (taste)
2. Spinal nucleus of Trigeminal (general)

Question 6

Course

Answer 6

1. Leaves skull through jugular foramen
2. Descend inside carotid sheath between ICA and IJV
3. Leaves sheath by passing forwards with Stylopharyngeus between ICA and ECA
4. Enters pharynx between superior and middle constrictors (end gap)
5. Passes deep to Hyoglossus and divides into branches
   Upper part carries superior and inferior ganglia

Question 7

Branches

Answer 7

1. Motor
2. Tympanic branch
3. Sensory
   - carotid
   - tonsillar
   - pharyngeal
   - lingual

Question 8

Motor

Answer 8

Stylopharyngeus muscle

Question 9

Tympanic branch

Answer 9

Parasympathetic and sensory
1. It enters tympanic cavity
2. Unite with carotico-tympanic sympathetic fibers
3. Form tympanic plexus

Question 10

Tympanic branch supply

Answer 10

Supplies:
1. Middle ear mucosa
2. Auditory tube
3. Mastoid antrum
4. Parotid
Via lesser superficial petrosal nerve

Question 11

Carotid

Answer 11

1. Carotid sinus
2. Carotid body

Question 12

Tonsillar

Answer 12

1. Palatine tonsil
2. Soft palate

Question 13

Pharyngeal

Answer 13

2-3 branches
Unite with pharyngeal branches of vagus and superior cervical sympathetic ganglion forming pharyngeal plexus

Question 14

Pharyngeal supply

Answer 14

Oropharynx mucosa

Question 15

Lingual

Answer 15

Posterior 1/3 tongue (general and taste sensations)

Question 16

Applied anatomy injury

Answer 16

Injury leads to absence of:
1. Gag reflex
2. General
3. Taste
In posterior 1/3 tongue on lesion side