<prompt> The upward extension of thyroid swelling is prevented by which of the following structure attached to thyroid cailageSternothyroidPretracheal fasciaLigament of berryThyrohyoid membrane  <response>: Pretacheal fasciaprevents upward extension of thyroid swelling. It goes antero-lateral to trachea and continues posteriorly around oesophagus and as pharynx as buccopharyngeal fascia. It encloses: Trachea and oesophagus Thyroid gland Ant. Neck muscles 