At what gestational age do primitive respiratory bronchioles appear?

Question

Quizplus · Accepted Answer

Primitive respiratory bronchioles appear during the pseudoglandular stage of lung development, which occurs approximately between 5 to 17 weeks of gestation. However, the specific timeframe for the appearance of primitive respiratory bronchioles is generally placed within the range of 17-26 weeks, marking the transition into the canalicular stage, where the lung structures become more refined and capable of supporting gas exchange if birth occurs prematurely.

At What Gestational Age Do Primitive Respiratory Bronchioles Appear