CN11 Accessory nerve

Question 1

What is cranial nerve 11?

Answer 1

Accessory nerve

Question 2

What are the parts of the CN11 accessory nerve?

Answer 2

Cranial part

Spinal part

Question 3

How do the cranial and spinal parts of the CN11 accessory nerve arise?

Answer 3

CN11 accessory nerve divides into them shortly after it arises

Question 4

What is the route of the spinal part of the CN11 accessory nerve, from its origin to its innervation?

Answer 4

Passes superiorly through the foramen magnum
contacts cranial part at the jugular foramen
passes through jugular foramen
descends down neck in posterior triangle

Question 5

What does the spinal part of the CN11 accessory nerve innervate?

Answer 5

Sternocleidomastoid

Trapezius

Question 6

What are the functions of the spinal part of the CN11 accessory nerve?

Answer 6

Motor - sternocleidomastoid, trapezius

Question 7

What can cause damage to the spinal part of the CN11 accessory nerve?

Answer 7

Injury to posterior triangle of neck

Question 8

How is the function of the spinal part of the CN11 accessory nerve tested?

Answer 8

Test function of sternocleidomastoid and trapezius muscles

Question 9

What is the route of the cranial part of the CN11 accessory nerve from its origin?

Answer 9

Contacts spinal part at the jugular foramen
passes through the jugular foramen
joins the vagus nerve