The Erector Spinae Group

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The nine (9) muscles of the Erector spinae group are deep back muscles. They include the Iliocostalis Lumborum, Iliocostalis Thoracis, Iliocostalis Cervicis, Longissimus Thoracis, Longissimus Cervicis, Longissimus Capitis, Spinalis Thoracis, Spinalis Cervicis, and Spinalis Capitis.

Iliocostalis Cervicis

The Iliocostalis Cervicis is a deep muscle of the back.

Anatomical Attachments:

• Origin: Attaches to the angles of the 3rd, 4th, 5th and 6th ribs.
• Insertion: Attaches to the transverse processes of the 4th, through 6th cervical vertebrae.

Action: Collectively, these muscles extend, flex laterally, rotate the spinal column, and laterally move the pelvis.

Nerve Supply: Posterior rami of spinal nerves.

Vascular supply: Intercostal and lumbar arteries.

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