Back muscles: The muscles of the back are

The muscles of the back are essential for supporting the spine, maintaining good posture, and allowing for movement of the trunk and spine. Find out about back muscles , including their types and functions. Learn about the symptoms of back injury and how to strengthen your back muscles . Since the all the back muscles originate in embryo (fetus) form by locations other than the back, muscles in the superficial, as well as, intermediate groups, are extrinsic muscles . Anterior rami of spinal nerve innervate them. Muscles associated and involved in movements of the upper limb belong to the superficial group. The intermediate group might perform a respiratory action and comprises of muscles connected to the ribs. The deep group of muscles is called intrinsic muscles because they ...