<prompt> In emergency tracheostomy the followingstructures are damaged except:Isthmus of the thyroidInferior thyroid aeryThyroid imaInferior thyroid vein  <response>: Inferior thyroid aery Ref: Keith L Moore 5e p1100Isthmus, 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 