Splenius Cervicis Muscle Under the Skin, Posterior View

Description

Centered in the posterior cervical region, the splenius cervicis occupies the deeper layer of the lateral neck, lying inferior to splenius capitis and coursing superolaterally from the upper thoracic spinous processes toward the transverse processes of C1 to C3. Superficially, the trapezius spans from the occiput and nuchal ligament to the shoulder girdle, framing the midline over the cervical and upper thoracic spinous processes. Lateral contours of the neck hint at sternocleidomastoid anteriorly, while the deltoid caps the shoulder and triceps brachii defines the posterior arm. Erector spinae columns run longitudinally on either side of the vertebral column, with latissimus dorsi sweeping inferolaterally across the back. Posterior access to the splenius cervicis matters when teaching the layered anatomy of the nuchal musculature and when interpreting the muscular sources of neck pain after extension injuries. Palpation, dry needling, and trigger point injection planning all benefit from understanding how the trapezius and splenius capitis can obscure the deeper splenius cervicis, and how the muscle’s line of pull contributes to ipsilateral rotation and extension at the cervical spine. A common clinical pattern. Myofascial pain in the splenii often refers to the occiput and upper cervical region and can be mistaken for cervicogenic headache; the segmental innervation via dorsal rami (predominantly C3 to C6) helps explain tenderness and referral patterns. Use this posterior male figure for gross anatomy lab guides, kinesiology coursework on cervical extension and rotation, or as a plate in a spine chapter discussing whiplash-associated disorders and posterior cervical myalgia. It also suits clinical education materials on safe needle trajectories and surface landmarks over the midline cervical spine and upper thorax. Anatomical accuracy verified by SciePro's Medical Advisory Board.