lung bud


Also found in: Dictionary, Thesaurus, Encyclopedia.

tracheal bud

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)
Primordial pharynx that gives rise to the epithelial lining of the respiratory tract on glands of the bronchial tree.
Synonym(s): lung bud, tracheobronchial diverticulum.

lung bud

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.
See also: bud
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.