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Lungs - Anatomy & Physiology (view source)
Revision as of 07:49, 13 August 2008
, 07:49, 13 August 2008→Structure
*In most species the lungs are divided into lobes by the bronchial tree:
*In most species the lungs are divided into lobes by the bronchial tree:
**Left Lung = Cranial and Caudal lobes.
**Left Lung = Cranial and Caudal lobes.
**Right Lung = Cranial, Caudal, Middle and Accessory lobes. The cranial lobe is further divided by an external fissure.
**Right Lung = Cranial, Caudal, Middle and Accessory lobes. The cranial lobe is further divided by an external fissure.[[Image:Routeofairthroughrespiratorysystem.jpg|right|thumb|200px|'''Schematic Diagram showing the route air takes through the respiratory system''']]
*The bulk of the lung consists of bronchi, blood vessels and connective tissue. The terminal bronchioles have alveoli scattered along their length, and are continued by alveolar ducts, alveolar sacs and finally alveoli.
*The bulk of the lung consists of bronchi, blood vessels and connective tissue. The terminal bronchioles have alveoli scattered along their length, and are continued by alveolar ducts, alveolar sacs and finally alveoli.
**Alveolar Ducts: These have alveoli which open on all of it's sides, they have no 'walls' as such. Openings to individual alveoli are guarded by smooth muscle.
**Alveolar Ducts: These have alveoli which open on all of it's sides, they have no 'walls' as such. Openings to individual alveoli are guarded by smooth muscle.
**Alveolar Sacs: These are rotunda-like areas on the end of the alveolar ducts, usually there are clusters of these at the end of each duct.
**Alveolar Sacs: These are rotunda-like areas on the end of the alveolar ducts, usually there are clusters of these at the end of each duct.