Splenius Capitis Muscle, Lateral View

Description

Seen in lateral profile, the splenius capitis forms a superficial oblique band on the posterolateral neck, spanning from the lower nuchal region of the occipital bone down toward the midline ligamentum nuchae and the spinous processes of C7 to T3 or T4. Its fibers course superolaterally, lying posterior to the sternocleidomastoid and superior to the upper trapezius, with the deeper cervical extensors (including semispinalis capitis) occupying the plane immediately anterior to it. Cervical vertebrae, the occiput, and the posterior elements of the upper thoracic spine provide the bony context. Clean landmarks. Lateral orientation matters here because splenius capitis is a frequent pain generator in cervicogenic headache and whiplash-associated disorders, where tender points near its cranial attachment can refer pain toward the mastoid and temporal region. The muscle also helps explain coupled head and neck motion: bilaterally it extends the cervical spine, while unilateral contraction contributes to ipsilateral rotation and lateral flexion, a pattern clinicians test during physical examination and that surgeons respect during posterior cervical exposure. For injections, palpation, or dissection, knowing what lies superficial or deep to this muscle prevents confusing it with levator scapulae at the lower cervical level. Use this asset in gross anatomy labs and neck/back modules to teach layers of the posterior cervical musculature and their attachments to the occiput and cervical vertebrae. It also suits neurology and pain-medicine publications discussing cervicogenic headache pathways, and orthopaedic or rehabilitation materials on whiplash mechanics and posterior cervical approach anatomy. Anatomical accuracy verified by SciePro's Medical Advisory Board.