primary bronchial buds

tra·che·o·bron·chi·al di·ver·tic·u·lum

the endodermal lung primordium that will give rise to the epithelial lining of the respiratory tract.

primary bronchial buds

two outgrowths from the respiratory diverticulum, which ultimately become the right and left primary bronchi and also give rise to the secondary bronchial buds.

pri·mar·y bron·chi·al buds

(prī'mar-ē brong'kē-ăl bŭdz)
The first bronchial buds resulting from bifurcation of the tracheal bud; they give rise to the main bronchi.