serratus posterior inferior (muscle)
Definition: lower intermediate muscle of back; 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(s): musculus serratus posterior inferiorTA, inferior posterior serratus muscle
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