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Detailed Histology Of Alveolar sacs (air sacs) and Inter-Alveolar Septum

Detailed Histology Of Alveolar sacs (air sacs):

These are groups of cup shaped structures (alveoli with 200 nm diameter and are the structural and functional units of respiratory gas exchange) with very thin walls and open into a common central space Because of interdigitating arrangement each alveolus does not have a completely separate wall. Adjacent alveoli are separated from each other by Interalveolar septa.

INTERALVEOLAR SEPTUM: It is the two layers of squamous epithelial cells in between which lies the Interstltlum possessing richest capillary network of the body, fibroblasts, elastic and reticular fibres and macrophages. The interalveolar septum is composed of: (1) capillary endothelial type cells (30%); (2) type I pneumocytes (08%); (3) type II pneumocytes (16%); interstitial cells (mast cells and fibroblasts etc.) (36%) and; (4) alveolar macrophages (10%).

 

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