Changes

==Introduction==

==Introduction==

[[Image:Routeofairthroughrespiratorysystem.jpg|right|thumb|250px|'''Schematic Diagram showing the route air takes through the respiratory system''']]

[[Image:Routeofairthroughrespiratorysystem.jpg|right|thumb|300px|'''Schematic Diagram showing the route air takes through the respiratory system''']]

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

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

==Histology==

==Histology==

[[Image:Bronchiole Histology.jpg|right|thumb|350px|©Nottingham 2008]]

[[Image:Bronchiole Histology.jpg|right|thumb|300px|©Nottingham 2008]]

*The histology of the '''Bronchi''' is almost identical to that of the [[Trachea - Anatomy & Physiology|trachea]] - the lumen of the bronchus is lined by a pseudostratified epithelium, including goblet cells and serous cells.

*The histology of the '''Bronchi''' is almost identical to that of the [[Trachea - Anatomy & Physiology|trachea]] - the lumen of the bronchus is lined by a pseudostratified epithelium, including goblet cells and serous cells.