🔙 The muscles of the back include those that move the vertebral column, help maintain posture, and are involved in movements of the pectoral girdle and arm. The muscles of the back can be categorised into two main groups: the extrinsic and the intrinsic muscles. The extrinsic muscles of the back are generally involved in movements of the pectoral girdle, arm and ribs. The most superficial of the extrinsic muscles are the trapezius and latissimus dorsi muscles. Deep to these muscles, in the inte

Multifidus is a group of short, triangular muscles that along with the semispinalis and rotatores comprises the transversospinal group of deep back muscles. They are the thickest muscles in the transversospinal group, and are shorter than semispinalis, but longer than rotatores. Multifidus is found on either side of vertebral column, extending from the cervical all the way to the lumbar spine. The group is regionally divided into cervical multifidus, thoracic multifidus and lumbar multifidus. Or