The trachea bifurcates at the levels of the 4th-6th intercostal space, approximately halfway between the thoracic inlet and the [[Diaphragm - Anatomy & Physiology|diaphragm]]. It divides into two Principle 'Bronchi', tubes which conduct air into the lungs. These further divide into smaller bronchi and bronchioles within the lung tissue. | The trachea bifurcates at the levels of the 4th-6th intercostal space, approximately halfway between the thoracic inlet and the [[Diaphragm - Anatomy & Physiology|diaphragm]]. It divides into two Principle 'Bronchi', tubes which conduct air into the lungs. These further divide into smaller bronchi and bronchioles within the lung tissue. |