tracheobronchial diverticulum

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.

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.