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 minor is a thin, flat muscle of the chest that is located underneath the pectoralis major. Since the pectoralis minor muscle is smaller and located underneath the pectoralis major, this muscle is thought of as the 'little brother muscle of the chest'. The pectoralis minor is located underneath the pectoralis major muscle.