Introduction to Respiratory System
- Embryonic period - begins at 4 weekQ
- Pseudoglandular period (6th week to 16 week) Q
- Incomplete fusion of these ridges results - Tracheo-esophageal fistula.
- Incomplete fusion - Congenital diaphragmatic hernia of Bochdalek most commonly on left side.
- Canalicular period (16th and 26-28th week) Q
- âType II pneumocytes
- Saccular period (26-28 week)Q
- Alveolar period
- Thyroid hormone - stimulates septations