Embryology 3 Flashcards
Where does the tubular outgrowth occur? And what does this outgrowth develop into?
From the foregut
Develops into trachea and lung buds
When does trachealoesophgus fistula occur?
When trachea and esophagus doesn’t separate
WHat does the gut tube form from?
Endoderm
At which week does the development of trachea and lung occur? Where?
Week 4 of gestation
From ventral wall of foregut
Which derm is involved in the formation of the pleura?
Lateral plate Mesoderm
Splacnic = visceral Somites = parietal
What does the Oesophagotracheal septum do?
then develops between oesophagus and trachea, completely separating them into trachea ventrally and oesophagus dorsally
Define atresia
a condition in which an orifice or passage in
the body is (usually abnormally) closed or absent.
Define fistula
an abnormal or surgically made passage between a tubular organ and the body surface, or between two hollow or tubular organs, ie. between 2 epithelialized surfaces.
What pleural cavity will somatic mesdoderm layer form?
Parietal pleura
What pleural cavity will splachnic mesdoderm layer form?
Visceral
What is the gap between parietal and visceral pleurae called?
pleuroperitoneal canals
What are the stages from foetal period to postnatal period?
Embryonic, pseudo glandular then canalicular then saccular and alveolar
What age does the number of alveolar reach adult number?
8 years
What is a surfactant and by which cell is it secreted by?
is mixture of phospholipids and proteins secreted by type 2 pneumocytes
What percentage of neonates are effected by Respiratory distress syndrome? And what is the major cause?
2%
Surfactant deficiency
