The North American Industry Classification System (NAICS) is a numerical system that classifies business establishments by industry. This system is used by Federal statistical agencies for the purpose of collecting, analyzing, and publishing statistical data related to the U.S. business economy.nd although the NAICS code system is used more often today, the SIC system is still being used by some government bodies, including the Securities and Exchange Commission. NAICS industries are identified by a 6-digit code, in contrast to the 4-digit SIC code.
Trapezius Muscle. The trapezius is one of the major muscles of the back and is responsible for moving, rotating, and stabilizing the scapula (shoulder blade) and extending the head at the neck. It is a wide, flat, superficial muscle that covers most of the upper back and the posterior of the neck.
The trapezius muscle, also called the traps, is a pair of large triangular muscles extending over the shoulders and back of the neck. It connects the base of the skull to the top of your shoulder blades and attaches to the spinous processes of the spine.The trapezius muscle affects and is affected by your posture. Because of its location, it can cause headaches, stiff neck pain and can be a trigger for migraine headaches.hiplash. Traumatic injury such as whiplash can cause a sore trapezius muscle. During an accident or injury the head is snapped backwards and then forwards, straining the trapezius muscles and causing neck pain, according to the MayoClinic.com. Whiplash can be caused by auto accidents, physical abuse or contact sports.