| serratus posterior inferior | (n) a thin quadrilateral muscle at the junction of the thoracic and lumbar regions; acts to counteract the pull of the diaphragm on the ribs to which it is attached |
| serratus posterior superior | (n) a thin quadrilateral muscle of the upper and dorsal part of the thorax; acts to elevate the upper ribs |
| posterior serratus muscle | (n) skeletal muscle that draws the rib cage backward and downward, Syn. serratus posterior, musculus serratus posterior |