bud

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In humans, primary lung buds develop during the fourth week of gestation from the endoderm of the foregut.
Pulmonary sequestration is the result of an accessory lung bud that develops from the ventral primitive foregut as it migrates caudally.
28 days, 4 to 6 mm), the respiratory diverticulum, trachea, and the right and left lung buds are evident.