The studies were carried out on 100 right and 100 left lungs taken from human corpses of both sexes whose age varied from 1 month to 80 years. The material was divided into 3 age groups. The pulmonary arteries were injected 65% duracryl and then digested in sulfuric acid. The specimens obtained were examined to measurement the length and the diameter of the interlobar portion of the pulmonary arteries and their correlation indexes to the age, the length and the body weight. It was certain, that the pulmonary arteries dimensions still grows during man's extrafetal life; the diameter of the right pulmonary artery is usual greater than the left artery. The length of the interlobar portion of the right pulmonary artery varied in both sexes from 5 to 43 mm, and from 6 to 43 mm on the left pulmonary artery. The diameter of the some part of pulmonary arteries varied from 3 to 21 mm on the right side, and from 4.5 to 20 mm on the left side.