Respiratory Embryo Flashcards
What does the tracheo-esophageal septum separate?
foregut into dorsal portion (esophagus) and ventral (trachea and lung buds)
What maintains communication with pharynx and lung buds?
laryngeal orifice
Where is the mesenchyme surrounding larynx derived?
4-6 pharyngeal arches (cartilage and muscle)
What does vacuolization and recanalization or larynx produce?
lateral recesses known as laryngeal ventricles
What are the lateral recesses bounded by?
false and true vocal cords
What n is associated with arch 4? 6?
4 = sup laryngeal 6 = recurrent laryngeal
What are the spaces for lungs on each side of foregut called?
pericadioperitoneal canals
What separates the peri-cardio-peritoneal canals from the peritoneal and pericardial cavities?
pleuro-peritoneal and pleura-pericardial folds
- separation forms primitive pleural cavities
What regulates branching of bronchi?
EMT between endoderm of lung buds and splanchnic mesoderm
Where is the bifurcation of the trachea at birth?
T4
What is the canalicular phase?
bronchioles dividing into smaller and smaller canals
How does respiration become possible?
due to cellular differentiation, development of primitive alveoli and presence of capillaries necessary for gas exchange
What allows for conditioning of respiratory muscles?
fetal breathing mvmts near term causing aspiration of amniotic fluids
What has little increase in size after birth? lots of increase?
alveoli = little
bronchioles and alveoli = increase
