Posterior Major Rectus Capitis, Lateral View

Description

Positioned deep to the posterior cervical musculature, the rectus capitis posterior major runs obliquely from the spinous process of C2 (axis) superiorly and medially to the lateral part of the inferior nuchal line of the occipital bone. A lateral perspective places it just posterior to the atlanto-occipital and atlanto-axial joints, with the posterior arch of C1 (atlas) and the laminae of the upper cervical vertebrae forming the bony backdrop. The muscle occupies the medial portion of the suboccipital triangle, bordered laterally by the obliquus capitis superior and inferior, and it lies immediately adjacent to the expected course of the third part of the vertebral artery as it grooves the atlas. Small, but thick. This is the view most clinicians want when teaching why upper cervical biomechanics behave differently from the rest of the neck: rectus capitis posterior major acts as a short extensor and ipsilateral rotator, coupling motion between the axis and occiput through the atlas. Its location in the suboccipital region matters in posterior approaches to C1 to C2 instrumentation and during dissections that expose the vertebral artery, where excessive lateral retraction can place the artery and the C2 dorsal ramus at risk. Headache clinics also reference this anatomy when discussing suboccipital myofascial pain patterns and occipital neuralgia associated with irritation of the greater occipital nerve as it emerges inferior to the obliquus capitis inferior and then pierces semispinalis capitis. Use this lateral rendering in gross anatomy labs, spine surgery atlases, and radiology teaching that correlates deep suboccipital muscles with CT or MRI of the craniovertebral junction. It also suits patient-facing education on cervicogenic headache and targeted physical therapy for upper cervical extensor overactivity. Anatomical accuracy verified by SciePro's Medical Advisory Board.