Splenius Cervicis

Description

Running obliquely across the posterolateral neck, the splenius cervicis is isolated as a distinct strap of muscle deep to splenius capitis and superficial to the deeper intrinsic back muscles, with fibers coursing superolaterally from the upper thoracic spinous processes toward the transverse processes of the upper cervical vertebrae. Superiorly, the skull base frames the craniovertebral junction, while inferiorly the muscle’s origin aligns with the upper thoracic vertebrae and adjacent rib cage. Anterolaterally, the scapula anchors the shoulder girdle landmarks, helping orient the cervical spine in relation to the upper back. Bony references include the cervical vertebrae, upper thoracic vertebrae, and scapula, all rendered to clarify the muscle’s positional anatomy in a male. Clear separation of splenius cervicis from adjacent spinal musculature matters when teaching posterior neck layering and when interpreting pain generators in the cervicothoracic junction. Tenderness or trigger points in splenius cervicis can mimic cervicogenic headache patterns and contribute to restricted cervical rotation, while its deep location explains why it is often conflated with splenius capitis on exam and on surface palpation. Surgeons and proceduralists also benefit from recognizing its course relative to the posterior elements of the cervical spine when planning posterior approaches and when discussing safe trajectories for paraspinal injections. Use this artwork in gross anatomy lab manuals to reinforce intrinsic back muscle stratification, in spine and MSK teaching decks that contrast splenius capitis versus splenius cervicis, and in clinical education materials addressing posterior neck pain referral patterns and cervical range-of-motion assessment. Anatomical accuracy verified by SciePro's Medical Advisory Board.