Cervical spinal nerve 3

Cervical spinal nerve 3

The plan of the cervical and brachial plexuses.

The Cervical spinal nerve 3 (C3) is a spinal nerve of the cervical segment. It originates from the spinal cord between the second and third cervical vertebrae. This nerve plays a crucial role in the nervous system, contributing to the cervical plexus and the phrenic nerve.

Structure[edit | edit source]

The C3 nerve, like other spinal nerves, is formed by the union of the anterior and posterior roots from the spinal cord. The nerve then branches out to supply various parts of the body. The C3 nerve primarily provides sensory innervation to the skin of the neck and contributes to motor innervation of the neck muscles.

Function[edit | edit source]

The C3 nerve has both sensory and motor functions. It provides sensation to the skin of the neck and parts of the head. In terms of motor function, it contributes to the nerve supply of the sternocleidomastoid and trapezius muscles, which are responsible for various movements of the neck and shoulders.

Clinical significance[edit | edit source]

Damage to the C3 nerve can result in loss of sensation or movement in the areas it supplies. This can occur due to various conditions such as spinal cord injury, herniated disc, or spinal stenosis. Treatment typically involves addressing the underlying cause and may include medication, physical therapy, or surgery.