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1-3) The greater occipital nerve derives from the medial branch of dorsal ramus of C2 while the lesser occipital nerve arises from branches of C2 and C3 in the cervical plexus.
The dorsal rami of C2 gives rise to the greater occipital nerve, while the lesser occipital nerve is a combination of both the C2 and C3 ventral rami.
the posterior auricular branch--which innervates the auricularis posterior, the cranially oriented muscles of the auricle, and the occipital muscles--communicates with the greater auricular nerve, the auricular branch of the vagus nerve, and the lesser occipital nerve (3)