origin: superior borders of the angles of lower 6 ribs medial to the
tendons of insertion of the
Iliocostalis Lumborum ;
insertion: into the angles of the upper 6 or 7 ribs and into the
transverse process of the 7th cervical vertebrae;
action: acting bilaterally, extension and hyperextension of the spine;
acting unilaterally, laterally flexes the spine;
nerve supply: posterior rami of the spinal nerves;
synergists:
i1lioCost8LUMB5[Iliocostalis Lumborum ,
LongisTHrocais[Longissimus Thoracis ,
Spinalis Thoracis , Semispinalis Thoracis ;
