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The following 2 entries include the term serratus-posterior.
serratus posterior inferior
noun: a thin quadrilateral muscle at the junction of the thoracic and lumbar regions that arises chiefly from the spinous processes of the lowest two thoracic and first two or three lumbar vertebrae, is inserted into the lowest four ribs, and acts to counteract the pull of the diaphragm on the ribs to which it is attached
serratus posterior superior
noun: a thin quadrilateral muscle of the upper and dorsal part of the thorax that arises chiefly from the spinous processes of the lowest cervical and the first two or three thoracic vertebrae, is inserted into the second to fifth ribs, and acts to elevate the upper ribs
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Merriam-Webster unabridged
