Psoas major originates from the transverse processes and bodies of which vertebrae?

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Multiple Choice

Psoas major originates from the transverse processes and bodies of which vertebrae?

Explanation:
Origin along the thoracolumbar region: the psoas major attaches to the sides of the bodies of the lower thoracic and upper lumbar vertebrae, specifically from T12 down to L5, and to the adjacent intervertebral discs, with additional fibers anchoring to the transverse processes of the lumbar vertebrae. This location explains why the correct range includes T12 through L5. Ranges that stop higher in the thoracic region or miss part of L5 don’t capture the full proximal attachment of this muscle, and those that don’t include T12–L5 don’t reflect its true origin.

Origin along the thoracolumbar region: the psoas major attaches to the sides of the bodies of the lower thoracic and upper lumbar vertebrae, specifically from T12 down to L5, and to the adjacent intervertebral discs, with additional fibers anchoring to the transverse processes of the lumbar vertebrae. This location explains why the correct range includes T12 through L5. Ranges that stop higher in the thoracic region or miss part of L5 don’t capture the full proximal attachment of this muscle, and those that don’t include T12–L5 don’t reflect its true origin.

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