Anatomy/Pathogenesis. Pincer-type FAI is secondary to acetabular overcoverage, and. although this is typically anteriorly based, overcoverage can. be present superiorly and posteriorly as well.1-14 This acetab-. ular overcoverage results in impingement of the acetabular. rim against the femoral neck during range of motion. The.
They are supported by the surrounding lung tissue. The lungs are slightly different on each side. The right lung is divided into 3 sections called the upper, middle and lower lobes. The left lung is divided into 2 sections called the upper and lower lobes.
There are thousands of these bronchioles in each lung, each of which continue to branch off into even tinier tubes. Each of the smallest tubes eventually ends in a very tiny air sac. These air sacs are called alveoli [al-VEE-uhl-eye]. Healthy lungs contain more than 300 million of these tiny air sacs.