Iliocostalis Cervicis, Lateral View

Description

Seen in left lateral profile, the iliocostalis cervicis occupies the posterolateral cervical region as the most lateral column of the erector spinae, running superiorly from the angles of the upper ribs (classically ribs 3 to 6) to the posterior tubercles of the transverse processes of the mid cervical vertebrae (often C4 to C6). Medial to it, the longissimus cervicis and spinalis components lie closer to the spinous processes, while the trapezius forms a broad superficial sheet over the posterior neck and shoulder and the deltoid caps the lateral shoulder. Anteriorly, the sternocleidomastoid courses obliquely from sternum and clavicle to mastoid process, with facial muscles defining the side of the face; a red vessel along the neck corresponds to the common carotid artery continuing as the internal carotid within the carotid sheath. Palpation and treatment of posterior neck pain often misses this muscle because it sits deep to the trapezius yet remains accessible near the upper rib angles, where myofascial trigger points can refer pain toward the occiput and posterior shoulder. For clinicians correlating lateral neck anatomy with motion, this fiber direction makes the iliocostalis cervicis a clear contributor to ipsilateral cervical lateral flexion and extension, a common pattern in whiplash-associated disorders. Deep but directional. Use this artwork when teaching erector spinae compartmental anatomy in gross anatomy or kinesiology labs, or when illustrating manual therapy, dry needling, and posterior cervical strengthening protocols that distinguish the iliocostalis column from longissimus and the more anterior scalenes. It also fits atlas plates and textbook figures that need a lateral neck reference integrating muscle layering with the carotid artery’s course for safe landmark-based instruction. Anatomical accuracy verified by SciePro's Medical Advisory Board.