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Flashcards in Exam 2 CN XI Deck (16)
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1

The accessory nerve carries exclusively what type of info

Motor

2

What two roots contribute to the lower motor neurons of accessory nerve

Cranial and spinal

3

What do the cranial and spinal lower motor neurons supply

SCM, trapezius, muscles of soft palate, pharynx and larynx

4

Cranial root of accessory nerve has cell bodies located where

Nucleus ambiguus

5

Where is the spinal nucleus of the accessory nerve found

Anterior horn of the gray matter

6

Where does the spinal nucleus of accessory nerve extend from

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

7

Where does the cranial root of accessory nerve emerge from

The MO where it then combines briefly with the spinal root and then exits the foramen magnum

8

Fibers from cranial root separate from the spinal root and joins what

Vagus nerve at inferior ganglion

9

What happens when the cranial root combines with vagus nerve

The fibers are distributed to pharyngeal plexus, external and recurrent laryngeal nerves and contribute to motor supply of laryngeal muscles other than cricothyroid

10

Rootlets of spinal root emerge from where?

Lateral aspect of cervical cord between anterior and posterior rootlets

11

What does the spinal root form after combining

Form a trunk to ascend between denticulate ligaments and posterior rootlets then entering through foramen magnum

12

The spinal root passes ___ where it combines with cranial root and passes through the ____

Laterally/ jugular foramen

13

The spinal root passes deep to where

SCM

14

What does the spinal root traverse to get to the trapezius muscle

The posterior triangle

15

What else contributes to motor supply of trapezius besides accessory nerve

Cervical plexus

16

The accessory nerve and cervical plexus supply what parts of the trapezius

Accessory = upper and middle portions
Cervical plexus = lower 2/3 of muscle