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Accessory Nerve (CN XI)
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Slides Anatomy Accessory Nerve CN XI.pdf
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Download Lecture Overview
00:01 Cranial nerve XI is a little different from the others in the sense that it actually originates from fibers coming from the spinal cord. 00:12 Those fibers merge and actually enter the cranial cavity through the foramen magnum, where they briefly joined with some cranial fibers that actually will split off and do something unrelated to the accessory nerve, but it will still have to exit the cranial cavity again, and once it does, that's how it earns its designation as a cranial nerve, even though it doesn't come off of the brain directly. 00:37 Once the accesory nerve exits the cranial cavity, it heads out towards two muscles that innervates, sternocleidomastoid and trapezius.
About the Lecture
The lecture Accessory Nerve (CN XI) by Darren Salmi, MD, MS is from the course Neurovasculature of the Head.
Included Quiz Questions
Which muscles are innervated by the accessory nerve? Select all that apply.
- Trapezius
- Sternocleidomastoid
- Masseter
- Buccinator
- Temporalis
Author of lecture Accessory Nerve (CN XI)
Darren Salmi, MD, MS
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