exam 2 accessory nerve

Question 1

what type of information is carried by the accessory nerve?

Answer 1

it is strictly a motor nerve

Question 2

what are the two roots of the accessory nerve?

Answer 2

cranial and spinal

Question 3

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

Answer 3

sternocleidomastoid
trapezius
muscles of the soft palate
pharynx 
larynx

Question 4

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

Answer 4

nucleus ambiguus

Question 5

where is the spinal nucleus of the accesoory nerve found?

Answer 5

anterior horn of the gray matter

Question 6

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

Answer 6

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

Question 7

what is the apparent origin of the accessory nerve?

Answer 7

series of rootlets of lateral aspect of medulla oblongata

Question 8

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

Answer 8

they exit the skull through the jugular foramen

Question 9

what opening does the accessory nerve exit the skull?

Answer 9

jugular foramen

dont 5 it because the last question told you…

Question 10

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

Answer 10

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

Question 11

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

Answer 11

pharyngeal plexus

external and recurrent laryngeal nerve

Question 12

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

Answer 12

motor supply of the laryngeal muscles except the cricoarytnoid

Question 13

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

Answer 13

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

Question 14

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

Answer 14

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

Question 15

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

Answer 15

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

Question 16

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

Answer 16

passes deep to sternocleidomastoid and sends motor fibers to it

Question 17

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

Answer 17

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

Question 18

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

Answer 18

cervical plexus