Question

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

the aortic arch

the pulmonary trunk

the left pulmonary artery

the lower branch of the right pulmonary artery

Explanation:

To solve this, we recall the anatomy of pulmonary arteries. The right pulmonary artery has upper and lower branches. The middle lobar artery (supplying the middle lobe of the right lung) is a branch of the lower branch of the right pulmonary artery. The aortic arch gives rise to other arteries, not middle lobar. The pulmonary trunk splits into left and right pulmonary arteries. The left pulmonary artery supplies the left lung, not the right lung's middle lobe.

Answer:

D. The lower branch of the right pulmonary artery (assuming options are labeled A - D as A. The aortic arch, B. The pulmonary trunk, C. The left pulmonary artery, D. The lower branch of the right pulmonary artery)