Introduction to Lung Development:

This is a diagram of the different phases of lung development. It describes the approximate time period lungs develop in a fetus and at what stage the lungs are in at a certain time period. Also, below are some descriptions of the five different phases that occur during lung development. I will go into more detail about the development of lungs as we learn about this new topic of growth.

http://www.embryology.ch/anglais/rrespiratory/phasen01.html