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|Noun||1.||serratus posterior - skeletal muscle that draws the rib cage backward and downward|
serratus posterior inferior - 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 - a thin quadrilateral muscle of the upper and dorsal part of the thorax; acts to elevate the upper ribs