Posterior Major Rectus Capitis

Description

Arising from the spinous process of C2 (axis), the rectus capitis posterior major runs superiorly and laterally to insert on the lateral part of the inferior nuchal line of the occipital bone, deep to semispinalis capitis and splenius capitis. Medial to it, the rectus capitis posterior minor typically spans from the posterior tubercle of C1 (atlas) to the medial inferior nuchal line, while the obliquus capitis superior and inferior define the lateral borders of the suboccipital region. Posterior bony landmarks include the occiput, posterior arch of the atlas, and the axis with its prominent spinous process, framing the atlanto-occipital and atlanto-axial articulations. Small but exacting anatomy. This posterior dissection-style view matters because the rectus capitis posterior major is a primary driver of ipsilateral rotation and extension at the upper cervical complex, and it sits immediately adjacent to the vertebral artery as it grooves the superior surface of the posterior arch of C1 before entering the foramen magnum. That relationship is a practical concern in C1 lateral mass screw placement and other posterior upper-cervical approaches, where dissection near the suboccipital triangle can risk vascular injury. It also supports teaching the functional distinction between the atlanto-occipital joint (flexion-extension, “yes”) and atlanto-axial joint (rotation, “no”). Use this illustration in head and neck anatomy labs to orient learners to the deep posterior cervical musculature once trapezius and semispinalis capitis are reflected, and in neurosurgical or orthopedic spine publications discussing posterior C1–C2 exposure, vertebral artery safety zones, or occipital headache sources linked to suboccipital muscle tension. It also suits radiology teaching when correlating upper cervical landmarks on CT or MRI with the suboccipital muscle group. Anatomical accuracy verified by SciePro's Medical Advisory Board.