A. Occipitofrontalis muscle B. Occipitalis muscle C. Greater occipital nerve D. Lesser occipital nerve E. Semispinalis capitis muscle ( 2x; left and right) F. Splenius capitis muscle (2x; left and right) G. Levator scapulae muscle (2x; left and right) H. Semispinalis cervicis muscle I. Multifidus muscle J. Oliquus capitis superior muscle K. Oliquus capitis inferior muscle L. Rectus capitis posterior major muscle M. Rectus capitis posterior minor muscle N. Spinous process of axis O. Vertebral artery P. Posterior belly of digastric muscle