Lung bud | definition of lung bud by Medical dictionary
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the outgrowth from the caudal end of the floor of the respiratory diverticulum.
res·pi·ra·to·ry di·ver·tic·u·lum (res'pir-ă-tōr-ē dī'vĕr-tik'yū-lŭm)
In the embryo, a pouch that grows out of each side of the developing foregut tube beginning at stage 12 (26 days). It pushes into the primitive pleural coeloms and continues to elongate and branch to become the embryonic lung.
References in periodicals archive
In humans, primary lung buds
develop during the fourth week of gestation from the endoderm of the foregut.
The intrapulmonary pulmonary arteries arise from the lung buds
and the extrapulmonary arteries arise from the proximal portion of the sixth aortic arch.
It has been demonstrated that the formation of accessory diaphragm is due to the improper timing in the interaction of the lung buds
and septum transversum.