Origin of iliocostalis lumborum?

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Multiple Choice

Origin of iliocostalis lumborum?

Explanation:
The question is about where the iliocostalis lumborum begins. This muscle, part of the erector spinae, has its origin at the iliac crest and the thoracolumbar fascia, with some fibers contributing from the sacral region. From there, it Ascends to attach to the angles of the lower ribs, forming a long lever across the lumbar spine. This origin lets the muscle extend the spine when both sides contract and help with lateral flexion when it acts unilaterally. The other attachments listed describe sites more typical of the muscle’s insertion (onto the lower ribs) or origins of other back muscles, not the iliocostalis lumborum. So, iliac crest and thoracolumbar fascia is the correct origin.

The question is about where the iliocostalis lumborum begins. This muscle, part of the erector spinae, has its origin at the iliac crest and the thoracolumbar fascia, with some fibers contributing from the sacral region. From there, it Ascends to attach to the angles of the lower ribs, forming a long lever across the lumbar spine. This origin lets the muscle extend the spine when both sides contract and help with lateral flexion when it acts unilaterally. The other attachments listed describe sites more typical of the muscle’s insertion (onto the lower ribs) or origins of other back muscles, not the iliocostalis lumborum. So, iliac crest and thoracolumbar fascia is the correct origin.

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