Serratus posterior inferior originates from which region?

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Enhance your understanding of back muscles with multiple choice questions and detailed explanations. Study the origin, insertion, action, and innervation of each muscle to get ready for your exam!

Multiple Choice

Serratus posterior inferior originates from which region?

Explanation:
Serratus posterior inferior starts from the spinous processes of the lower thoracic and upper lumbar vertebrae, typically T11 through L2, and from the thoracolumbar fascia. From there, its fibers run laterally and upward to attach to the inferior borders of ribs 9–12. This makes the region T11–L2 the correct origin. Regions like C7–T1 or T1–T4 belong to upper thoracic muscles (and relate to serratus posterior superior), while L4–L5 is too far down for this muscle. So the true origin is T11–L2.

Serratus posterior inferior starts from the spinous processes of the lower thoracic and upper lumbar vertebrae, typically T11 through L2, and from the thoracolumbar fascia. From there, its fibers run laterally and upward to attach to the inferior borders of ribs 9–12. This makes the region T11–L2 the correct origin. Regions like C7–T1 or T1–T4 belong to upper thoracic muscles (and relate to serratus posterior superior), while L4–L5 is too far down for this muscle. So the true origin is T11–L2.

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