This is a panoramic ultrasound view of the airway in longitudinal section.
A string of pearls
The tracheal rings and cricoid cartilage are sometimes referred to as a string of pearls. The largest “pearl” at the cranial end is the cricoid cartilage. Further cranially still is the thyroid cartilage.
The cricothyroid ligament and membrane
The cricothyroid ligament spans the space between the thyroid and cricoid cartilages in the midline anteriorly. The cricothyroid membrane lies between thyroid and cricoid cartilages and extends laterally beyond the ligament.
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