The Greater Occipital Nerve is a sensory nerve that originates from the cervical spine, specifically from the second cervical nerve root, or C2. It primarily provides sensation to the back of the scalp and the upper neck. This nerve plays a crucial role in transmitting sensory information, including pain and temperature, from these areas to the brain. In some individuals, irritation or compression of the Greater Occipital Nerve can lead to conditions such as occipital neuralgia, characterized by sharp, shooting pain in the back of the head. Treatment options may include medications, physical therapy, or nerve blocks to alleviate symptoms and improve quality of life.