origin: the transverse process of the 6th to 10 Thoracic vertebrae;
insertion: the spinous process of the 1st to 4th thoracic and 6th-7th cervical vertebrae;
action: extends the spine and rotates it toward the opposite side;
nerve supply: posterior rami of the thoracic nerves, T1 to T6;
synergists: Longissimus Thoracis , Iliocostalis thoracis, Spinalis Thoracis
Original Text by Clifford R. Wheeless, III, MD.
Last updated by Data Trace Staff on Tuesday, August 16, 2011 12:32 pm