Posterior Major Rectus Capitis, Gross Anatomy

Description

Seen from a posterior perspective, the rectus capitis posterior major occupies the deep suboccipital region, running superomedially from the spinous process of C2 (axis) to the lateral part of the inferior nuchal line on the occipital bone. Its thick, short fibers sit immediately deep to the semispinalis capitis and splenius capitis (typically removed or made translucent in this type of plate), flanking the midline over the posterior arch of C1 (atlas) and the upper cervical spinous processes. Superiorly it approaches the external occipital protuberance but remains lateral to the nuchal ligament. Surrounding landmarks often visible in this field include the occipital squama, posterior elements of C1 and C2, and adjacent suboccipital muscles such as the obliquus capitis inferior and rectus capitis posterior minor. Orientation of this muscle matters because it forms the medial boundary of the suboccipital triangle, a compact corridor where the third part of the vertebral artery curves posteriorly over the atlas before entering the foramen magnum, and where the suboccipital nerve (dorsal ramus of C1) emerges. Small, deep muscles here are common pain generators in cervicogenic headache patterns, and the rectus capitis posterior major has been implicated in enthesopathic irritation at the inferior nuchal line and in myofascial trigger points that refer pain to the occiput. A tight field. Easy to get disoriented. Educators can drop this plate into gross anatomy labs on the posterior neck and back, neuroanatomy sessions on upper cervical dorsal rami, or surgical teaching files covering posterior approaches to C1-C2 instrumentation and vertebral artery risk zones. It also supports clinical manuals on occipital neuralgia, suboccipital release techniques, and the anatomy of the craniocervical junction. Anatomical accuracy verified by SciePro's Medical Advisory Board.