Normal lung - Elastic stain

A bronchovascular bundle with a bronchiole to the left and an adjacent muscular pulmnary artery to the right. Note the internal and external elastic laminae in the pulmonary artery; this is unique to muscular pulmonary arteries. The external elastic lamina is not present in muscular arteries in the systemic circulation. The bronchiole contains a single elastic lamina and might be mistaken for a blood vessel if the epithelium is missing.

Done