Histology Of ALVEOLAR DUCTS:
The respiratory bronchioles continue into thin walled small tubes called alveolar ducts .The walls of these ducts are studded with alveolar sacs and alveoli, which open into lumen of the duct.
The lining epithelium is simple squamous or low cuboldal.
The lamina propria consists of smooth muscles and connective tissue containing elastic and collagen fibers.
Alveolar ducts terminate into pulmonary atria, which are Irregular spaces from which alveolar sacs and alveoli diverge. Elastic and reticular fibers form a complex network encircling the opening of atria, alveolar sacs and alveoli.
The elastic fibers enable the aiveoli to expand with inspiration and contract passively with expiration.
Reticular fibres serve as a support that prevent overdistension and damage to delicate capillaries as well as thin alveolar septa.
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