<P> The cervical nerves innervate the sternohyoid, sternothyroid and omohyoid muscles . </P> <P> A loop of nerves called ansa cervicalis is part of the cervical plexus . </P> <P> The thoracic nerves are the twelve spinal nerves emerging from the thoracic vertebrae . Each thoracic nerve T1 - T12 originates from below each corresponding thoracic vertebra . Branches also exit the spine and go directly to the paravertebral ganglia of the autonomic nervous system where they are involved in the functions of organs and glands in the head, neck, thorax and abdomen . </P> <P> Anterior divisions: The intercostal nerves come from thoracic nerves T1 - T11, and run between the ribs . At T2 and T3, further branches form the intercostobrachial nerve . The subcostal nerve comes from nerve T12, and runs below the twelfth rib . </P>

What are the nerves called that emerge from the thoracic region of the spinal cord