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Bronchi and Bronchioles - Anatomy & Physiology (view source)
Revision as of 18:47, 10 December 2010
, 18:47, 10 December 2010no edit summary
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==Introduction==
==Introduction==
Between species the diameter of the bronchi and bronchioles vary greatly and more significantly than the variations of the [[Trachea - Anatomy & Physiology|trachea]]. The number of bronchial divisions before bronchioles are present varies by species - small mammals such as mice may have only 4/5 generations, whereas 12+ may be necessary in larger animals. [[Avian Respiration - Anatomy & Physiology|Avian Respiration]] is very different to that of mammals. The [[Respiration in Non-Homeotherms - Anatomy & Physiology|Respiratory Systems of non-Homeotherms]] are also very different to that of mammals.
Between species the diameter of the bronchi and bronchioles vary greatly and more significantly than the variations of the [[Trachea - Anatomy & Physiology|trachea]]. The number of bronchial divisions before bronchioles are present varies by species - small mammals such as mice may have only 4/5 generations, whereas 12+ may be necessary in larger animals. [[Avian Respiration - Anatomy & Physiology|Avian Respiration]] is very different to that of mammals. The [[Respiration in Non-Homeotherms - Anatomy & Physiology|Respiratory Systems of non-Homeotherms]] are also very different to that of mammals.
==Histology==
[[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.
Beneath the narrow layer of connective tissue under the epithelium lie well-developed spiral bands of [[Muscles - Anatomy & Physiology#Smooth Muscle|smooth muscle]].
*The '''Bronchioles''' have no [[Bones and Cartilage - Anatomy & Physiology#Types of Cartilage|cartilage]] rings but have well developed [[Muscles - Anatomy & Physiology|muscular]] walls to enclose the lumen. The epithelium is reduced to cuboidal, and in the normal animal it contains no mucus secreting glands. There are many [[Lymph Nodes - Anatomy & Physiology|lymphoid]] nodules beneath the epithelial layer.
*'''Respiratory Bronchioles''' have few alveoli scattered along the length, at the entrance of which is ''simple squamous'' epithelium, and bronchial [[Muscles - Anatomy & Physiology#Smooth Muscle|smooth muscle]] bundles.
==Links==
==Links==