What is the origin of serratus posterior inferior?

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Multiple Choice

What is the origin of serratus posterior inferior?

Explanation:
Serratus posterior inferior starts from the spinous processes of the lower thoracic and upper lumbar spine, specifically T11 through L2 (often with some involvement from the thoracolumbar fascia). From there, its fibers run laterally and downward to insert on the inferior borders of ribs 9–12. This proximal attachment location matches its role in pulling the lower ribs downward during expiration and providing proprioceptive input for the rib cage. Other potential origins don’t fit this muscle’s pattern: the origin at C7–T3 is for serratus posterior superior, which attaches to the upper ribs, while origins lower down like L5–S1 don’t align with rib attachment.

Serratus posterior inferior starts from the spinous processes of the lower thoracic and upper lumbar spine, specifically T11 through L2 (often with some involvement from the thoracolumbar fascia). From there, its fibers run laterally and downward to insert on the inferior borders of ribs 9–12. This proximal attachment location matches its role in pulling the lower ribs downward during expiration and providing proprioceptive input for the rib cage.

Other potential origins don’t fit this muscle’s pattern: the origin at C7–T3 is for serratus posterior superior, which attaches to the upper ribs, while origins lower down like L5–S1 don’t align with rib attachment.

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