Exam 2 CN XI Flashcards
The accessory nerve carries exclusively what type of info
Motor
What two roots contribute to the lower motor neurons of accessory nerve
Cranial and spinal
What do the cranial and spinal lower motor neurons supply
SCM, trapezius, muscles of soft palate, pharynx and larynx
Cranial root of accessory nerve has cell bodies located where
Nucleus ambiguus
Where is the spinal nucleus of the accessory nerve found
Anterior horn of the gray matter
Where does the spinal nucleus of accessory nerve extend from
About the level of foramen magnum inferiorly to C5 or C6 cord level
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
Fibers from cranial root separate from the spinal root and joins what
Vagus nerve at inferior ganglion
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
Rootlets of spinal root emerge from where?
Lateral aspect of cervical cord between anterior and posterior rootlets
What does the spinal root form after combining
Form a trunk to ascend between denticulate ligaments and posterior rootlets then entering through foramen magnum
The spinal root passes ___ where it combines with cranial root and passes through the ____
Laterally/ jugular foramen
The spinal root passes deep to where
SCM
What does the spinal root traverse to get to the trapezius muscle
The posterior triangle
What else contributes to motor supply of trapezius besides accessory nerve
Cervical plexus
