Summary
Summary The Accessory Nerve (CN XI)
- Module
- Nervous and Locomotor 2
- Institution
- University Of Southampton (UOS)
This is a summary of the anatomy and functions associated with the (spinal) Accessory Nerve (CN XI)
[Show more]
Content preview
The Accessory Nerve (CN XI) The (spinal) accessory nerve only has a somatic motor function by innervating
the sternocleidomastoid and trapezius muscles
Anatomical course:
1. Spinal part –
Originates from spinal nerve roots of the upper cervical spinal cord (primarily
C1-C6)
Once joined, these nerve roots form the accessory nerve and run superiorly to
enter the cranial cavity through the foramen magnum
It then transverses the posterior cranial fossa and exits the skull through the
jugular foramen with the glossopharyngeal and vagus nerves
From here the spinal part descends following the course of the internal carotid
artery before reaching the sternocleidomastoid muscle which it innervates.
After this point it continues across the posterior triangle of the neck to
innervate the trapezius muscle
2. Cranial part –
Arises from the lateral aspect of the medulla oblongata in the brainstem
It leaves the skull through the jugular foramen before combining with the
vagus nerve (CN X) at its inferior ganglion
From here the fibres are distributed through the vagus nerve
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller tobnot. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
50155 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now