What is the action of serratus posterior superior?

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Multiple Choice

What is the action of serratus posterior superior?

Explanation:
This question tests understanding that serratus posterior superior elevates the upper ribs during inspiration. When it contracts, it pulls ribs 2–5 upward, expanding the thoracic cavity to aid inhalation. Some sources also note a proprioceptive role, helping the nervous system sense rib cage position. It does not depress ribs, rotate the scapula, or extend the spine—the actions described belong to other muscles in the back and shoulder girdle. Its nerve supply comes from the upper intercostal nerves (T2–T5).

This question tests understanding that serratus posterior superior elevates the upper ribs during inspiration. When it contracts, it pulls ribs 2–5 upward, expanding the thoracic cavity to aid inhalation. Some sources also note a proprioceptive role, helping the nervous system sense rib cage position. It does not depress ribs, rotate the scapula, or extend the spine—the actions described belong to other muscles in the back and shoulder girdle. Its nerve supply comes from the upper intercostal nerves (T2–T5).

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