2. Development of pleura
• After the formation of the head fold, the pericardium comes to lie on
the ventral aspect of the embryo , and the pericardio-peritoneal
canals wind backwards on either side of the foregut .
• The lung bud ,that arise from the foregut, now invaginate these
canals.
• As the bud enlarge to form the lungs, the canals balloon out to form
the pleural cavities
• Each pleural cavity now communicates with the pericardial cavity
through the pericardio-pleural opening and with the peritoneal
cavity through pleuro-peritonial opening
• Later on these openings are closed by formation of the pericardio-
pleural membrane & pleuro-peritoneal membrane respectively.
6. Answer the following questions
• 1. respiratory diverticulum develops
from......
• 2. time at which it develop.....
• 3. what are fates of it........
• 4. gene responsible for its development.......
7. Larynx
• 1. its source of development...
• 2.. Its epithelium derived from...
• 3. source of development of
EPIGLOTTIS....
• 4. any four applied.......
8. trachea
• 1. its source of development...
• 2. any four applied.......
• 3 . TEF......defn ,, type,,, complication...
• 4. VACTERL association
9. LUNG
• 1. its source of development...
• 2. any four applied.......
• 3. phases of maturation.....
A] name & features of phase I
B] name & features of phase II
C] name & features of phase III
D] name & features of phase IV
4. Source of development of pleura......
