Week 4-8: Embryonic Phase

Lung development in a fetus deer starts during the embryonic phase.

• Takes place during the first four or five weeks of gestation.
• Larynx, or voicebox, and the trachea, also known as the windpipe, begin to form.
• Two small buds branch off of the trachea, which will later develop as lungs. 
  
  

Key:

1=Right main bronchus

5=Left main bronchus

http://www.embryology.ch/anglais/rrespiratory/phasen02.html ttp://www.livestrong.com/article/163935-fetal-lung-development-stages/