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Cervical spinal nerve C4 helps control upward shoulder movements. Cervical spinal nerve C3, C4 and C5 help power the diaphragm and aid in breathing. Cervical spinal nerve C6 helps in wrist extension and some functioning of biceps. Cervical spinal nerve C7 controls triceps and wrist extension. Cervical spinal nerve C8 helps control the hand. [18]
Cervical spinal nerve 4, also called C4, is a spinal nerve of the cervical segment. It originates from the spinal cord above the 4th cervical vertebra (C4). It contributes nerve fibers to the phrenic nerve , the motor nerve to the thoracoabdominal diaphragm .
C1–C6: Neck flexors: C1–T1: Neck extensors: C3, C4, C5: Supply diaphragm (mostly C4) C5, C6: Move shoulder, raise arm ; flex elbow C6: externally rotate the arm C6, C7: Extend elbow and wrist (triceps and wrist extensors); pronate wrist C7, T1: Flex wrist; supply small muscles of the hand: T1–T6: Intercostals and trunk above the waist: T7 ...
In a radiculopathy, the problem occurs at or near the root of the nerve, shortly after its exit from the spinal cord. However, the pain or other symptoms often radiate to the part of the body served by that nerve. For example, a nerve root impingement in the neck can produce pain and weakness in the forearm.
Herniated disc at C6–C7 level. Cervical disc herniations occur in the neck, most often between the fifth and sixth (C5–6) and the sixth and seventh (C6–7) cervical vertebral bodies. There is an increased susceptibility amongst older (60+) patients to herniations higher in the neck, especially at C3–4. [23]
Occipito-cervical junction This disorder may result from rheumatoid arthritis, causing the hypermobility of the connection between the neck and head, resulting in paralysis or pain. [6] Cerebrovascular disease Cerebrovascular disease is a type of cervical spine disorder that can cause tetraplegia. [7] Subaxial cervical spine [8] Atlanto-axial joint