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The cricothyroid membrane is the fibrous tissue between the lower border of the thyroid cartilage and the upper border of the cricoids cartilage. This is where you can insert certain emergency airway devices.
The cricothyroid ligament is a median placed elastic ligament that is essentially the thickened median portion of the anterior cricothyroid membrane. It begins as a broad band attached to the upper anterior aspect of the cricoid cartilage and narrows as it ascends to attach to the lower anterior aspect of the thyroid cartilage.
Helps bind the cricoid and thyroid cartilages while limiting the anterior-posterior rocking of the thyroid cartilage on the cricoid cartilage.