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.
Pectoralis major: a triangular muscle located directly under the pectoantebrachialis. In a cat, it is smaller than the pectoralis minor. Originates at the sternum and inserts at the humerus.The pectoralis major also assists in allowing the arm to be brought closer to the middle of the chest.n a cat, it is smaller than the pectoralis minor. Originates at the sternum and inserts at the humerus. The pectoralis major also assists in allowing the arm to be brought closer to the middle of the chest.