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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.
The Longissimus Cervicis is a deep muscle of the back.
Anatomical Attachments: Action: Acting with the Longissimus Thoracis extends the vertebral column, flexes it to one side, and pulls the ribs inferiorly.
Synergist: Semispinalis capitis and cervicis, Splenius capitis and cervicis, Spinalis cervicis, Interspinales, Iliocostalis cervicis, Multifidus. Antagonist: Sternocleidomastoid, Longus colli and capitis, Scalenus anterior, medius, and posterior.
Nerve Supply: Posterior rami of the spinal nerves Vascular supply: Intercostal and lumbar arteries, muscular branches of the occipital, and the deep cervical branches of the costocervical trunk arteries
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The Erector Spinae Group
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Longissimus Cervicis