Ebryology 3 Flashcards
when does the embryo begin to fold
week 3
what tissue layer forms the gut tube
endoderm
when do the lungs start to develop
week 4 of gestation
where to the lungs start to develop from on the embryo
from the ventral wall of the foregut
where does the larynx develop from
pharangeal pouches at the laryngotracheal groove
where does the epiglottis develop from
from the bottom of the hypopharyngeal eminence
where does the lung bud develop from
the laryngotracheal diverticulum enlarges to form the lung bud
where does the larynx cartilage develop from
4th and 6th pairs of pharyngeal arches
where does the epiglottis develop from
the bottom of the hypopharyngeal eminence
what is laryngeal atresia
birth defect complete upper airway obstruction that occurs when the larynx fails to open during a baby’s development in utero and remains blocked by cartilage or other tissue after birth.
when does the trachea and bronchial buds begin to develope
4 weeks
when does the secondary bronchia buds and right and left main bronchus begin to develop
5 weeks
when do the lobes of each lung begin to develop
6 weeks
what does hypoplasia mean
incomplete or absence of an organ
the lung matures in 4 stages when does the pseudoglandular stage happen (weeks)
6-16 weeks
during what weeks does the canalicuar stage take place in lung maturation
16-26 weeks
when does the terminal sac stage in lung maturation take place
26 weeks to birth
what does surfactant consist of
phospholipids and proteins
what stimulates the production of surfactant
corticosteroids and thyroxine
when does the alveolar stage of lung maturation take place (weeks)
at 32 weeks
what is a congenital lung cysts
lung contains air filled spaces known as cysts
the diaphragm develops from 4 embryonic components what are these called
septum transversum
pleuroperitoneal membranes
dorsal mesentry of esophagus
muscular ingrowth from lateral body walls
at what level are the roots of the phrenic nerve
C3-C5
