Development of Larynx: 4th-5th weeks of Embryogenesis

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What is the origin of the laryngeal cartilages?

Mesenchyme derived from the 6th pharyngeal arch

Mesenchyme that is derived from neural crest cells (correct)

Mesenchyme derived from the 4th pharyngeal arch

Endoderm of the laryngotracheal tube

What is the outcome of recanalization of the laryngeal epithelium by the 10th week?

Complete closure of the glottis

Temporary occlusion of the lumen (correct)

Formation of the T-shaped laryngeal inlet

Permanent occlusion of the lumen

What is the result of the growth of the larynx and epiglottis during the first three years after birth?

The larynx and epiglottis remain in their fetal form

The larynx and epiglottis become non-functional

The larynx and epiglottis reach their adult form (correct)

The larynx and epiglottis continue to grow rapidly

What is the cause of congenital high airway obstruction syndrome?

Obstruction of the upper fetal airway (B) Signup and view all the answers

What is the characteristic feature of laryngeal atresia?

Dilation of the airways distal to the atresia (B) Signup and view all the answers

What is Tracheal Diverticulum characterized by?

A blind, bronchus-like projection from the trachea (B) Signup and view all the answers

During which week does the primordium of the main bronchus develop?

5th week (B) Signup and view all the answers

What is the number of tertiary bronchial buds that develop on each side during the 6th week?

10 (D) Signup and view all the answers

What is the origin of the visceral pleura?

Splanchnic mesoderm (D) Signup and view all the answers

How many orders of branches develop after birth?

7 (C) Signup and view all the answers

What is the embryonic structure that gives rise to the larynx, trachea, and lungs?

Laryngotracheal diverticulum (A) Signup and view all the answers

What is the name of the structure that separates the dorsal foregut (esophagus) from the ventral lung bud (larynx, trachea, and lung)?

Tracheoesophageal septum (C) Signup and view all the answers

At which day of embryonic development does the foregut produce a ventral evagination called the respiratory diverticulum or lung bud?

22 (C) Signup and view all the answers

What is the name of the structure that remains in communication with the primordial pharynx through the primordial laryngeal inlet?

Laryngotracheal diverticulum (A) Signup and view all the answers

What is the term for the longitudinal folds that develop in the laryngotracheal diverticulum and fuse to form a partition?

Tracheoesophageal folds (B) Signup and view all the answers

During which week of gestation does the incomplete recanalization of the larynx occur, resulting in a membranous web at the level of the vocal folds?

10 weeks (B) Signup and view all the answers

What is the consequence of the blockage in prenatal USG Laryngeal atresia on the development of the lungs?

Underdeveloped lungs (C) Signup and view all the answers

What is the result of the struggle to breathe against the blockage in prenatal USG Laryngeal atresia?

Fetal hydrops (D) Signup and view all the answers

What develops from the endoderm of the LTT distal to the larynx?

Epithelium and glands of the trachea (D) Signup and view all the answers

What is the consequence of the underdeveloped lungs on the heart and major blood vessels in prenatal USG Laryngeal atresia?

They are compressed (A) Signup and view all the answers