CN XI- Accessory Nerve

Question 1

Characteristic of CN XI

Answer 1

Formed from a cranial root emerging from the medulla and a spinal root arising from the superior region of the spinal cord

The spinal root passes upward into the cranium via the foramen magnum

The accessory nerve leaves the cranium via the jugular foramen

Question 1

CN XI Pathway

Answer 1

Question 2

Type of Nerve

Answer 2

Motor

Question 3

Muscle Innervation

Answer 3

Supplies motor fibers to the larynx, pharynx, and soft palate

Innervates the trapezius and sternocleidomastoid
Move the head and neck

Question 4

Clinical Application

Answer 4

Lesion of CN XI

Weakness in turning the head to the opposite side

Shoulder dropping on the affected side

Question 5

2-minute CN XI

Answer 5

2-Minute Neuroscience: Accessory Nerve (Cranial Nerve XI)

Adapted from Neuroscientifically Challenged | YouTube Channel