Question

multiple choice question
the inferior lobar artery is a branch of which of the following?

the pulmonary trunk
the upper branch of the right pulmonary artery
the lower branch of the right pulmonary artery
the left pulmonary artery

Explanation:

To determine the origin of the inferior lobar artery, we recall anatomical knowledge: The right pulmonary artery divides into upper and lower branches. The inferior lobar artery is a branch of the lower branch of the right pulmonary artery. The pulmonary trunk splits into right and left pulmonary arteries, so the pulmonary trunk isn't the direct source. The upper branch of the right pulmonary artery supplies upper lobes, not inferior lobar. The left pulmonary artery's branching doesn't include the inferior lobar artery of the right lung (or relevant for this structure's origin here). So the correct option is the lower branch of the right pulmonary artery.

Answer:

C. The lower branch of the right pulmonary artery (assuming option labels are A: The pulmonary trunk, B: The upper branch of the right pulmonary artery, C: The lower branch of the right pulmonary artery, D: The left pulmonary artery)