Major Rectus Capitis Muscle Beneath the Skin, Posterior View

Description

Beneath the reflected posterior scalp and superficial cervical fascia, the rectus capitis posterior major (rectus capitis posterior major muscle) occupies the deep suboccipital layer, running superomedially from the spinous process of the axis (C2) to the lateral part of the inferior nuchal line of the occipital bone. Lateral to it lie the obliquus capitis inferior and obliquus capitis superior, with rectus capitis posterior minor positioned medial and slightly superior, closer to the midline occiput. More superficially, fibers of semispinalis capitis and splenius capitis descend inferolaterally, and the upper trapezius forms the broad posterior contour over the cervical spine. The posterior arch of the atlas (C1) and upper cervical spinous processes anchor the scene. Orientation at C1 to C2 matters. Rectus capitis posterior major acts as a primary extensor and ipsilateral rotator of the head, and its relationship to the atlantoaxial joint makes it a frequent point of discussion in cervicogenic headache and in manual therapy targeting suboccipital hypertonicity. The suboccipital nerve (dorsal ramus of C1) courses in this compartment, and the nearby vertebral artery curves through the suboccipital triangle just deep to the semispinalis capitis and adjacent to these short muscles, a practical consideration during posterior C1 lateral mass and C2 pedicle instrumentation. Small space, high stakes. Faculty can drop this plate into gross anatomy lab guides when students struggle to separate semispinalis capitis from the true suboccipital group, or into neurosurgery and orthopedic spine teaching materials covering posterior exposure of the craniovertebral junction. It also fits well in headache clinic education on occipital neuralgia, where the greater occipital nerve pierces semispinalis capitis more inferiorly but is discussed alongside suboccipital pain generators. Anatomical accuracy verified by SciePro's Medical Advisory Board.