Iliocostalis Cervicis

musculus iliocostalis cervicis

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.

Nerve: Posterior rami of cervical spinal nerves Blood Supply: Deep cervical artery Region: Neck

Anatomical Data

Origin, Insertion & Supply

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

Biomechanics

Function & Actions

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.

Clinical Relevance

Clinical Notes

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.

Palpation

Palpable in the lateral cervical region lateral to the semispinalis capitis, deep to the trapezius and splenius.

Pathology

Common Injuries & Conditions

Cervical Extensor Strain

Acute injury from whiplash or sustained posture producing lateral cervical pain, managed with early mobilisation.