Innervation of the iliocostalis (erector spinae)?

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Multiple Choice

Innervation of the iliocostalis (erector spinae)?

Explanation:
The iliocostalis is part of the intrinsic back muscles that run along the spine to extend and stabilize the vertebral column. These deep back muscles are innervated by the dorsal rami of the spinal nerves, which branch posteriorly to supply the muscles of the back and the facet joints. Ventral (anterior) rami supply most trunk and limb muscles, not these intrinsic back muscles, and the sympathetic chains provide autonomic fibers rather than somatic motor to skeletal muscle. So the iliocostalis receives innervation from the dorsal rami of spinal nerves.

The iliocostalis is part of the intrinsic back muscles that run along the spine to extend and stabilize the vertebral column. These deep back muscles are innervated by the dorsal rami of the spinal nerves, which branch posteriorly to supply the muscles of the back and the facet joints. Ventral (anterior) rami supply most trunk and limb muscles, not these intrinsic back muscles, and the sympathetic chains provide autonomic fibers rather than somatic motor to skeletal muscle. So the iliocostalis receives innervation from the dorsal rami of spinal nerves.

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