<prompt> The structure damaged in High Tracheostomy ?Thyroid isthmusAoic knuckleFirst tracheal ringRecurrent laryngeal nerve  <response>: Ans. isc i.e., First tracheal ringRef: Dhingra dle p 317High tracheostomy: Performed above the level of thyroid isthmus which lies against II, III and IV tracheal rings:Indicated in carcinoma larynx when laryngectomy is anticipated.Drawback : tracheostomy at this point violates the 1st ring of trachea and causes perichondritis of the cricoid cailage and subglottic stenosis, so it is better avoided. 