ANATOMY

Detailed explanation-1: -While fetal lung development consists in the pseudoglandular, canalicular and saccular stages, postnatal lung development comprises the stages of classical and continued alveolarization, as well as of microvascular maturation.

Detailed explanation-2: -The alveolar phase is characterized by the maturation of the alveoli, a process that takes place during the end of fetal life and many years after birth.

Detailed explanation-3: -Histologically, lung development and maturation has been divided into four stages: pseudoglandular, canalicular, terminal saccular, and alveolar (Fig. 3.2).

Detailed explanation-4: -The first stage of your baby’s lung development usually happens at 3-5 weeks during pregnancy. At five weeks, your baby is just 2mm long, but major organs are already beginning to form. A lung bud starts developing from a small tube of cells called the foregut (which also goes on to form the gut).