Sputum is mucus that is coughed up from the lower airways (the trachea and bronchi). The vocal folds are located within the larynx at the top of the trachea. It is thus the valve that diverts passage to either the trachea or the esophagus. Another sustained wounds to the trachea and esophagus and died. Actual or impending airway obstruction is a common indication for intubation of the trachea. The subglottal cavity consists of the trachea and the lungs. The respiratory system consists of the nose, nasopharynx, trachea, and lungs. This is because of abnormalities in the separation between the trachea and oesophagus during development. Tracheal intubation refers to the insertion of a catheter down the trachea. This anatomy can cause tiny nostrils, long palates and a narrow trachea. In front of the upper trachea lies connective tissue and skin. These are present in the midline of the neck anterior to the trachea. The vallecula is an important reference landmark used during intubation of the trachea. The trachealis muscle contracts during coughing, reducing the size of the lumen of the trachea. Tracheitis is an inflammation of the trachea.