<prompt> In emergency tracheostomy the following structures are damaged except?Isthmus of the thyroidInferior thyroid aeryThyroid imaInferior thyroid vein  <response>: Isthmus, thyroid ima aery and inferior thyroid veins are midline structures and thus can be injured during tracheostomy, more so during emergency tracheostomy. Inferior thyroid aery, a branch of the thyrocervical trunk of the subclan aery lies laterally away from midline, thus can escape injury. In emergency tracheostomy following structures can be damaged: - Isthmus - Inferior thyroid veins - Thyroid ima aery - Left brachio-cephalic vein, jugular venous arch - Pleura especially infants - Thymus - Esophagus the trachea is small, mobile, and soft in infants damage the esophagus 