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Flashcards in exam 2 accessory nerve Deck (18)
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1
Q

what type of information is carried by the accessory nerve?

A

it is strictly a motor nerve

2
Q

what are the two roots of the accessory nerve?

A

cranial and spinal

3
Q

the cranial and spinal roots of the accessory nerve provide lower motor neurons to what muscles?

A
sternocleidomastoid
trapezius
muscles of the soft palate
pharynx 
larynx
4
Q

cell bodies from what nucleus provide axons to the cranial root of the accessory nerve?

A

nucleus ambiguus

5
Q

where is the spinal nucleus of the accesoory nerve found?

A

anterior horn of the gray matter

6
Q

what levels does the spinal nucleus of the accessory nerve exist?

A

approximately the level of the foramen magnum inferiorly to the C5 or C6 cord level

7
Q

what is the apparent origin of the accessory nerve?

A

series of rootlets of lateral aspect of medulla oblongata

8
Q

what happens when the cranial root emerges from medulla oblongata and briefly joins with the spinal root?

A

they exit the skull through the jugular foramen

9
Q

what opening does the accessory nerve exit the skull?

A

jugular foramen

dont 5 it because the last question told you…

10
Q

upon exiting the skull the cranial and spinal roots separate, where does the cranial root go?

A

they join the vagus nerve at the inferior ganglion (nodose ganglion)

11
Q

where are the cranial root fibers carried in the vagus distributed to?

A

pharyngeal plexus

external and recurrent laryngeal nerve

12
Q

the cranial root fibers distributed in the pharyngeal plexus, external and recurrent laryngeal provide innervation for what?

A

motor supply of the laryngeal muscles except the cricoarytnoid

13
Q

where do the rootlets of the accessory spinal root emerge from?

A

lateral aspect of the cervical cord, between the posterior and anterior rootlets

14
Q

the rootlets of the spinal root combine to form a trunk that will?

A

ascend between the denticulate ligaments and the posterior rootlets to enter the skull through the foramen magnum

15
Q

upon entering the skull through the foramen magnum what does the spinal root do?

A

passes laterally to combine with the cranial root and pass through the jugular foramen

16
Q

after exiting the skull through the jugular foramen it passes deep to what muscle?

A

passes deep to sternocleidomastoid and sends motor fibers to it

17
Q

after passing posterior to the SCM it transverses the posterior triangle and passes deep to what muscle?

A

trapezius also sending some motor fibers to the upper and middle portions of the muscle

18
Q

though the accessory nerve supplies the upper and middle portions what other innervation is evidently supplying the lower 2/3 of trapezius?

A

cervical plexus