In many countries, PAP machines are only available by prescription. A sleep study at an accredited sleep lab is usually necessary before treatment can start. This is because the pressure settings on the PAP machine must be tailored to a patient's treatment needs.
The pectoralis major muscle also performs internal rotation -- turning your arm in toward your body. This action, also called medial rotation, is important for reaching behind your back to tuck in your shirt and combing your hair on the opposite side of your head.
The Pectoralis Major muscles (also known as the Pecs) are located on the front of the rib cage. The Pecs attach to the humerus near the shoulder joint and originate on the breastbone in the center of the chest. The fibers of the Pectoralis muscles run like a fan across the chest.he Pectoralis Major muscles (also known as the Pecs) are located on the front of the rib cage. The Pecs attach to the humerus near the shoulder joint and originate on the breastbone in the center of the chest. The fibers of the Pectoralis muscles run like a fan across the chest.