Studies were carried out on 100 right lungs taken from human cadavers of both sexes aged from 1 month to 80 years. The material was divided into 3 age groups. The pulmonary artery and the bronchi were injected with 65% duracryl and then digested in sulfuric acid. Specimens were examined to determine the number and dimensions of the branches of the right pulmonary artery penetrating upper lobe of the right lung. It was found that in most cases 2 and 3 branches arose from right pulmonary artery. In about 60% of cases the branches which penetrated the lobe were the superior trunk and one or two subsegmental branches. In a dozes or so of cases three types were found: only superior trunk, the apicoanterior trunk and independent segmental or subsegmental branches, the apicoposterior trunk and the remaining branches.