Upward extension of thyroid swelling is PREVENTED by what attatched to thyroid cailage ?
Pretrachial layer extends inferiorly from the base of the skull posteriorlyand the hyoid bone and thyroid cailage anteriorly and laterally and provide fascial sheaths of varying thickness for the thyroid gland larynx trachea pharynx and esophagus inferiorly it continues into superior mediastinum along the great vessels and fuses with the fibrous pericardium. ref : bd chaurasia
Pre tracheal fascia
Ligament of Berry
Thyrohyoid membrane
Sterno thyroid
All India exam