The suboccipital muscles form the boundaries of the suboccipital triangle, an area that contains several important structures (Fig. 2.52):
The rectus capitis posterior major muscle forms the medial border of the triangle.
The obliquus capitis superior muscle forms the lateral border.
The obliquus capitis inferior muscle forms the inferior border.
The contents of the suboccipital triangle include: posterior ramus of CI, vertebral artery, and veins