Embryology Flashcards
From what structure does the respiratory system come from?
Foregut of primitive gut tube
From what structure do the lung buds come from?
Ventral wall of primitive foregut
From what structure does the trachea come from?
Ventral wall of primitive foregut
From what structure does the ventral trachea and dorsal esophagus come from?
Oesphagotracheal septum
It divides the oesophagus from the trachea during prenatal development.
From what structure do the lungs come from?
Lung buds
From what structure does the visceral pleura come from?
Splanchnic layer of lateral plate mesoderm
From what structure does the parietal pleua come from?
Somatic layer of lateral plate mesoderm
From what structure does the central tendon of the diaphragm come from?
Septum transversum
From what structure does the muscular part of the diaphragm come from?
Skeletal muscle ingrowth from periphery
What happens in the following stage of lung development?
Embryonic 3-7 weeks
Lung buds start to develop as a respiratory diverticulum from the foetal foregut
What happens in the following stage of lung development?
Pseudoglandular 7-17 weeks
Development of all lung structures exept respiratory part (no gas exchange)
What happens in the following stage of lung development?
Canalicular 17-27 weeks
Formation of respiratory part, Alveolar ducts form and epithelium starts to differentiate into Type I and Type II pneumocytes (still no gas exchange)
What happens in the following stage of lung development?
Saccular 27-40 weeks
Formation of alveolar sacs, primitive alveoli, and surfactant.
Gas exchange begins
What happens in the following stage of lung development?
Alveolar 32 weeks – 8 years
Proliferation of alveoli from alveolar sacs.
About 95% of adult alveoli formed postnatally. 300m alveoli in adult
