Definition: the group of deep back muscles that originate from transverse processes of the vertebrae and pass to spinous processes of higher vertebrae; they act as rotators and include the semispinalis (capitis, cervicis, thoracis), multifidus, and rotatores (cervicis, thoracis, lumborum) muscles. All are innervated by dorsal primary rami of spinal nerves.
Synonym(s): musculi transversospinalesTA, transversospinal muscle, transversospinales
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