Where does serratus posterior inferior insert?

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Multiple Choice

Where does serratus posterior inferior insert?

Explanation:
Serratus posterior inferior attaches to the inferior borders of the lower ribs, specifically ribs 9 through 12. It originates from the spinous processes of the lower-thoracic and upper-lumbar vertebrae and runs laterally to reach those ribs. This placement lets it depress the lower ribs during expiration, especially in forced breathing. The nerves supplying it are the lower thoracic intercostal nerves (T9–T12). The other rib ranges correspond to different muscles in the region, so they don’t describe this muscle’s insertion.

Serratus posterior inferior attaches to the inferior borders of the lower ribs, specifically ribs 9 through 12. It originates from the spinous processes of the lower-thoracic and upper-lumbar vertebrae and runs laterally to reach those ribs. This placement lets it depress the lower ribs during expiration, especially in forced breathing. The nerves supplying it are the lower thoracic intercostal nerves (T9–T12). The other rib ranges correspond to different muscles in the region, so they don’t describe this muscle’s insertion.

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