The greater occipital nerve is the medial branch of the dorsal ramus of the second cervical spinal nerve, C2. It arises from between the first and second vertebrae with the lesser occipital nerve. It runs posteriorly behind the articular processes. It runs to the inferior obliquus capitis muscle. This nerve penetrates the semispinalis capitis and trapezius muscles to innervate the skin of the posterior portion of the scalp to the vertex of the skull.

Nervus occipitalis major

Nerf grand occipital