Describe the development of the diaphragm and thoracic cavities. List the respiratory changes before and after birth. To discuss the main features of physiological maturation of the lung and the importance of this to fetal and newborn viability. Examine the serial sections of human and pig with reference to the respiratory system. Week 6 descent of heart and lungs into thorax.
Pleuroperitoneal foramen closes.
Week 7 enlargement of liver stops descent of heart and lungs. 3-6 lungs appear glandular end month 6 alveolar cells type 2 appear and begin to secrete surfactant month 7 respiratory bronchioles proliferate and end in alveolar ducts and sacs Pig Serial Sections References Selected Lists of References from PubMed March 1999 search results are available for School of Anatomy computers without internet access. Functions to lower surface tension, allowing lungs to remain inflated. About Notes These notes from the Embryology Program compiled and written by Dr Mark Hill. Note Links to PubMed Medline Entries are copies of originals for computers without internet access.