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Chapter 03 Growth, Development and Morphology of the Respiratory System

BOOK TITLE: NCCP Textbook of Respiratory Medicine

Author
1. Behera D
ISBN
9789350252123
DOI
10.5005/jp/books/11207_3
Edition
1/e
Publishing Year
2011
Pages
21
Author Affiliations
1. LRS Institute of Tuberculosis and Respiratory Diseases, Sri Aurobindo Marg, Mehrauli, New Delhi, India, LRS Institute of Tuberculosis and Respiratory Diseases, Sri Aurobindo Marg, New Delhi, LRS Institute of Tuberculosis and Respiratory Diseases, New Delhi, India; Postgraduate Institute of Medical Education and Research, Chandigarh, India, Postgraduate Institute of Medical Education and Research, Chandigarh, LRS Institute of TB and Respiratory Diseases, New Delhi, India, Postgraduate Institute of Medical Education and Research, Chandigarh (India), Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India; LRS Institute of Tuberculosis and Respiratory Diseases Sri Aurobindo Marg New Delhi, India, Lala Ram Swaroop Institute of Tuberculosis and Respiratory Diseases, Sri Aurobindo Marg, New Delhi, India, Postgraduate Institute of Medical Education and Research, Chandigarh, India, Postgraduate Institute of Medical Education and Research Chandigarh, India, Postgraduate Institute of Medica
Chapter keywords

Abstract

Various components of the human lungs develop and grow both during gestation and after birth. During prenatal development, the lung first appears as an epithelial bud or pouch from the primitive foregut at the caudal end of the laryngotracheal groove in the third week of gestation when the embryo is only 3 mm long. In humans, early lung formation lasts from day 26 to 27 weeks after conception. In situ, several physical forces are exerted on the developing lung, including fetal breathing movements, peristaltic airway contractions and lung fluid circulation. Postnatal life, the respiratory tract is arbitrarily divided into the upper and lower respiratory tract comprising of nasal airways, pharynx, larynx and trachea. The bony thorax provides protection for the lungs, heart and great vessels.

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