Serratus posterior inferior muscle
From WikiMD's Wellnesspedia
It originates at vertebrae T11 – L3 Inserts to the inferior borders of the 9th through 12th ribs, and is supplied by (artery, nerve) and actions include intercostal arteries intercostal nerves depress the lower ribs, aiding in expiration.
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Contributors: Prab R. Tumpati, MD