Where does the longissimus thoracis originate?

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Multiple Choice

Where does the longissimus thoracis originate?

Explanation:
The longissimus thoracis has a broad, multi-segmental origin from the posterior pelvis and lower spine, anchored by the thoracolumbar fascia. Specifically, it arises from the sacrum, iliac crest, and lumbar spinous processes via that fascia, forming part of the common tendon that gives rise to the erector spinae. This explains why this origin captures both the sacral/iliac attachment and the lumbar spinous contributions, rather than originating solely from coccyx, iliac crest alone, or only from the transverse processes of the lumbar vertebrae.

The longissimus thoracis has a broad, multi-segmental origin from the posterior pelvis and lower spine, anchored by the thoracolumbar fascia. Specifically, it arises from the sacrum, iliac crest, and lumbar spinous processes via that fascia, forming part of the common tendon that gives rise to the erector spinae. This explains why this origin captures both the sacral/iliac attachment and the lumbar spinous contributions, rather than originating solely from coccyx, iliac crest alone, or only from the transverse processes of the lumbar vertebrae.

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