primary bronchus

pri·mar·y bron·chus

the main bronchus arising at the tracheal bifurcation and extending into the developing lung of the embryo.

mainstem bronchus

Either of two (right and left) bronchi which continue from the trachea and in turn give rise to lobar (secondary) bronchi.
References in periodicals archive ?
Heyns, "Penile metastases from primary bronchus carcinoma--a case report and literature review," African Journal of Urology, vol.
Man, Primary Bronchus Amyloidosis Was Diagnosed by CT: A Case Report and Literature Review, Zhejiang University, Hangzhou, China, 2011.
The question posed was whether this mass could be ascribed to metastatic supraglottic carcinoma or if it was indeed a metachronous primary bronchus carcinoma, as the treatment of these two malignancies differs significantly.
* Bronchi: a single tube branching off from the trachea called the primary bronchus serves each lung.