The cervical portion of the iliocostalis is the most superior part of the lateral erector spinae column, bridging the upper ribs and lower cervical spine. It extends and laterally flexes the neck, working with the semispinalis and splenius group to maintain cervical lordosis and provide lateral stability. Trigger points in this muscle refer pain to the shoulder and scapular region.
| Origin | Angles of ribs 3 through 6 |
|---|---|
| Insertion | Posterior tubercles of transverse processes of C4 through C6 |
| Nerve Supply | Posterior rami of cervical spinal nerves |
| Blood Supply | Deep cervical artery |
| Actions | Extension of the cervical spine; Ipsilateral lateral flexion of the neck |
|---|
Providing lateral cervical stability during asymmetric loading, it prevents excessive contralateral neck flexion during one-arm carrying tasks.
Iliocostalis cervicis trigger points produce lateral neck and suboccipital pain with referral to the anterior chest in some individuals. Whiplash injuries damage this muscle alongside the other cervical extensors.
Palpable in the lateral cervical region lateral to the semispinalis capitis, deep to the trapezius and splenius.
Acute injury from whiplash or sustained posture producing lateral cervical pain, managed with early mobilisation.
