Cervical Spine Anatomy Periphreal Central Nervous System Dermatomes orthopeadic multimedia. Shows the cervical dermatomes and nerve roots. Sensation from the skin is relayed along limb and trunk peripheral nerves to the spinal nerves that enter the spinal cord. The spinal cord relays the sensation message to the brain and awareness. Each spinal nerve relays sensation messages from a particular area of skin. This skin area is called a dermatome, and each dermatome is named after the spinal nerve that carries its message. For instance the C5 dermatome on the shoulder uses the C5 spinal nerve near the base of the neck to relay its message to the brain. There are seven spinal nerve pairs in the neck, called C2 to C8, which supply dermatomes on the head, neck and arms. This is useful as the sensation in a dermatome may be due to irritation.
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