5.3 (CN X, XI, XII in neck)

Question 1

CN X path in neck

Answer 1

Right and Left vagus nerves enter the carotid sheaths. Each descends through the neck posterolateral to the common carotid arteries

Question 2

CN X branches

Answer 2

pharyngeal, superior laryngeal, recurrent laryngeal (right in the neck, left in the mediastinum), and the superior cardiac

Question 3

CN X Functional Defecits

Answer 3

1. Weak/hoarse voice
2. Tongue movement impaired
3. Dysphagia
4. Loss of gag reflex
5. Disruption to the thorax and abdomen

Question 4

CN XI path in neck

Answer 4

Crosses the IJ vein where it pierces the SCM and then sends a branch down to the trapezius.

Question 5

CN XI functions

Answer 5

Motor innervation to the SCM and the trapezius.

Question 6

CN XI Functional Defecits

Answer 6

Diminished or absent function of the SCM and upper part of the trapezius.

Question 7

CN XII path in neck

Answer 7

Passes between the internal carotid artery and the internal jugular vein, deep to the posterior belly of the digastric muscle.

Question 8

CN XII functions

Answer 8

Motor control to the muscles of the tongue.

Question 9

CN XII Functional Defecits

Answer 9

Paralyzed tongue causing difficulty swallowing, chewing and speaking.