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Serratus posterior inferior

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serratus posterior inferior

(Science: anatomy, muscle) origin, with latissimus dorsi, from spinous processes of two lower thoracic and two upper lumbar vertebrae; insertion, into lower borders of last four ribs; action, draws lower ribs backward and downward; nerve supply, ninth to twelfth intercostal.

Synonym: musculus serratus posterior inferior, inferior posterior serratus muscle.