All of the neck muscles except the cricothyroid muscle.

Carries de-oxygenated blood from the right ventricle to the lungs

median cricothyroid ligament

The cricothyroid ligament is of clinical importance mainly because it forms the larger part of the laryngeal membrane. It also prevents the cricoid and thyroid from travelling too far.

The emergency room physician or surgeon makes a cut in a thin part of the voice box (larynx) called the cricothyroid membrane. A tube is inserted and connected to an oxygen bag