Posterior Major Rectus Capitis Muscle Under the Skin, Lateral View

Description

Running obliquely from the spinous process of the axis (C2) to the lateral part of the inferior nuchal line, the rectus capitis posterior major lies deep in the suboccipital region beneath the skin and superficial posterior neck musculature. From a lateral perspective, its fibers sit posterior to the atlanto occipital and atlanto axial joints, with semispinalis capitis and splenius capitis positioned more superficial and slightly lateral, and the upper trapezius forming the most superficial posterior layer. Superiorly, the muscle approaches the occipital squama just inferior to the external occipital protuberance, while inferiorly it anchors to C2, medial to the attachments of levator scapulae on the upper cervical transverse processes. This angle matters because it clarifies how the suboccipital muscles couple extension with ipsilateral rotation at the craniocervical junction, a concept that often gets lost when learners only see posterior dissection plates. The rectus capitis posterior major forms the medial border of the suboccipital triangle (with obliquus capitis superior and inferior), a corridor where the vertebral artery curves across the posterior arch of the atlas and where the suboccipital nerve (dorsal ramus of C1) emerges. Small space, real consequences. Tension or dysfunction in this compartment is a common contributor to cervicogenic headache patterns, and the nearby greater occipital nerve (dorsal ramus of C2) helps explain referral of pain to the posterior scalp. Use this illustration for teaching head and neck anatomy in gross lab correlations, for neurology and pain medicine lectures on occipital neuralgia versus cervicogenic headache, and for surgical education discussing posterior approaches to the C1 to C2 region and the vertebral artery hazard zone. Anatomical accuracy verified by SciePro's Medical Advisory Board.