embryonic period

embryonic period
the earliest period or phase of lung development in utero, lasting from the third week after conception to the sixth week; it is sometimes not named as a defined period of lung development, which is instead considered to begin with the following pseudoglandular period. During this period, a ventral respiratory diverticulum (lung bud) arises from the caudal end of the laryngotracheal groove and grows into bronchial buds and the primordial trachea. Called also embryonic phase.

Medical dictionary. 2011.

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