Lobar bronchus to left cranial lobe

The lobar bronchus for the left cranial lobe is the secondary bronchus that provides ventilation to the left cranial lung lobe. In all domestic species (dog, cat, ruminants, horse) and in humans, this bronchus originates from the left main bronchus, after it has entered the pulmonar hilum.

It then divides into segmental and subsegmental branches to distribute air to the different parts of the left cranial lobe, which itself may be subdivided into a cranial and a caudal part in some species (e.g., in dogs and cats). Its origin is constant and does not exhibit the interspecific variability observed for the right cranial lobar bronchus.