Medical Dictionary

serratus posterior inferior


Medical Definition of serratus posterior inferior

  1. :  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

Illustration of serratus posterior inferior

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to cast off or become cast off

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