RT Book, Section
A1 Wells, Robert G.
SR Print(0)
ID 1148940980
T1 Developmental Abnormalities of the Lungs and Diaphragm
T2 Diagnostic Imaging of Infants and Children
YR 2015
FD 2015
PB McGraw-Hill Education
PP New York, NY
SN 9780071808392
LK accesspediatrics.mhmedical.com/content.aspx?aid=1148940980
RD 2024/04/19
AB Fetal  lung  development  can  be  categorized  into  the  embryonic,  pseudoglandular,  canalicular,  and  saccular  phases.1  Embryonic  development  begins  at  24  to  26  days  gestation  when  a  diverticulum  arises  from  the  ventral  wall  of  the  foregut.  Over  the  next  2  days,  the  right  and  left  lung  buds  arise  from  this  diverticulum.  The  developing  airways  become  separated  from  the  esophageal  portion  of  the  foregut  by  ingrowths  of  adjacent  mesoderm  that  form  the  tracheoesophageal  septum.  The  lung  buds  elongate  into  primary  lung  sacs,  and  the  5  secondary  bronchi  develop  as  outgrowths  of  the  primary  bronchi.  This  completes  the  embryonic  period,  at  approximately  the  end  of  the  fifth  week.