CN IX, X, XI

Question 1

Through which bone structure does CN IX, Glossopharyngeal, exit the cranial cavity?

Answer 1

jugular foramen

Question 2

List all the mixed cranial nerves.

Answer 2

• CN V, trigeminal
• CN VII, facial
• CN IX, glossopharyngeal
• CN X, vagus

Question 3

What are the functions of CN IX, glossopharyngeal?

Answer 3

• motor to stylopharyngeus muscle
• general sensation to post 1/3 tongue, pharynx (afferent part of gag reflex)
• chemo + baroreceptors of carotid sinus and body
• taste to post 1/3 tongue
• parasympathetic to parotid gland

Question 4

Which nucleus innervates the motor component of CN IX?

Answer 4

nucleus ambiguus

Question 5

Which nucleus innervates the general sensation component of CN IX?

Answer 5

nucleus of solitary tract

Question 6

Which nucleus innervates the taste sensation component of CN IX?

Answer 6

nucleus of solitary tract

Question 7

Which nucleus innervates the parasympathetic component of CN IX?

Answer 7

inferior salivatory nucleus and otic ganglion

Question 8

Which nerve innervates the palatine tonsil?

Answer 8

CN IX, glossopharyngeal

Question 9

Through which bone cavity does CN X, vagus, exit the cranial cavity?

Answer 9

jugular foramen

Question 10

Which nerve innervates the afferent part of the gag reflex? efferent part?

Answer 10

afferent gag reflex = CN IX, glossopharygeal
efferent gag reflex = CN X, vagus

Question 11

What muscles does the motor component of CN X, vagus, innervate?

Answer 11

soft palate, pharynx, larynx

Question 12

Which nucleus innervates the motor component of CN X, vagus?

Answer 12

nucleus ambiguus

Question 13

Describe the sensory component of CN X, vagus.

Answer 13

• sensory to soft palate, pharynx, larynx –> VOCATION
• baroreceptor to hollow organs (GI)

Question 14

Which nucleus innervates the sensory component of CN X, vagus?

Answer 14

nucleus of solitary tract

Question 15

Describe the parasympathetic function of CN X, vagus.

Answer 15

• increase GI motility
• decrease heart rate
• visceral afferents from organs to CNS

Question 16

Which nucleus innervates the parasympathetic component of CN X, vagus?

Answer 16

dorsal motor nucleus of vagus (DMNV in brainstem)

Question 17

What does damage to CN X, vagus cause?

Answer 17

difficulty in speech and swallowing

Question 18

Why does damage to one recurrent laryngeal nerve (connected to CN X, only cause a hoarse voice?

Answer 18

The right recurrent laryngeal nerve takes over the other functions?

Question 19

through which bone cavity does CN XI, spinal accessory nerve, exit the cranial cavity? enter?

Answer 19

enter = foramen magnum
exit = jugular foramen

Question 20

Which vertebrae does the spinal accessory nucleus span?

Answer 20

C2-C5

Question 21

Which muscles does CN XI, spinal accessory, innervate?

Answer 21

sternocleidomastoid and trapezius

Question 22

If you turn your head left, does the right sternocleidomastoid muscle contract or relax?

Answer 22

head left, right muscle CONTRACT