41. On Monday, the doctors closed the small opening in Havel's trachea . 42. The trachea , laryngx, lower pharynx and esophagus all lie behind the thyroid. 43. Tracheoesophageal fistula ( TEF ) represents an abnormal opening between the trachea and esophagus. 44. The trachea normally dilates slightly during breathing in and narrows slightly during breathing out. 45. The trachea open through spiracles into this air film, allowing access to oxygen. 46. A hollow tube is used inserted into the trachea to keep the airway open. 47. A shorter trachea may improve air exchange and increase lung ventilation in diving mammals. 48. The trachea of the costal vein is perhaps a branch of the subcostal trachea. 49. The trachea of the costal vein is perhaps a branch of the subcostal trachea . 50. The rapidly growing worms soon obstruct the lumen of the trachea , causing suffocation.
