respiratory system embryology

Epithelium of the internal lining of the larynx, trachea, bronchi, and lungs is entirely of __________ origin.

• Splanchic mesoderm

• Endodermal

• Neural crest cells

• Neuroectodermal

• None of the above

The cartilagnious, muscular, and connective tissue components of the trachea and lungs are derived from _____________ surrounding the foregut.

• Splanchnic mesoderm

• Endodermal

• Neural crest cells

• Neuroectodermal

Which one is not a stage of maturation of lungs?

• Pseudoglandular stage

• Canalicular stage

• Terminal Sac Stage

• Bronchiolar stage

• Alveolar stage

Fill the bank : When the embryo is approximately 4 weeks old ………… ………….. appears as an outgrowth from the ventral wall of the …………..

• respiratory diverticulum/ foregut

• Lung buds/midgut

• respiratory diverticulum/ hindgut

• respiratory diverticulum/ pharyngeal gut

Which component is able to separate the foregut into dorsal and ventral portion:

• tracheoesophageal septum

• tracheoesophageal ridges

• laryngeal orifice

• Tracheoesaphageal fistula

What is the dorsal portion of foregut?

• trachea

• esophagus

• laryngeal orifice

• none of them

What is the ventral portion of foregut?

• trachea

• esophagus

• laryngeal orifice

• none of them

The respiratory primordium maintains its communication with the pharynx through the ………….

C.

• laryngeal orifice

• trachea

• esophagus

• None of them.

Which of the following is not right for tracheoesaphageal fistula?

• These defects occur in approximately in 1/3000 births

• Predominantly affect female infants

• TEF is the most common anomaly in the lower respiratory tract

• All are the right

How many secondary bronchi are in the right part of developing lung?

• 3

• 2

• 5

• 10