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.
Location of the Trapezius and the Rhomboids. The Trapezius (see in the diagram at the left) is a large muscle located in the back, from the base of the head, to the end of the scapula, and then along the spine to almost the middle of the back. (Thanks to Wikipedia for both drawings.) The Rhomboids â there is a Rhomboid Major and a Rhomboid Minor â are two muscles on the back that connect to the scapula and the spinal column. The Rhomboid Major is in the shape of a quadrilateral.