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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–L1: Abdominal muscles L1–L4
There are 8 cervical spinal nerves of the peripheral nervous system. Cervical spinal nerves C1, C2 and C3 help control the movements of the head and neck. Cervical spinal nerve C4 helps control upward shoulder movements. Cervical spinal nerve C3, C4 and C5 help power the diaphragm and aid in breathing.
The giraffe's neck is elongated by heterochrony, extension of the time for the embryonic development of these bones. [ 4 ] By convention, the cervical vertebrae are numbered, with the first one (C1) closest to the skull and higher numbered vertebrae (C2–C7) proceeding away from the skull and down the spine.
There is an increased susceptibility amongst older (60+) patients to herniations higher in the neck, especially at C3–4. [23] Symptoms of cervical herniations may be felt in the back of the skull, the neck, shoulder girdle, scapula, arm, and hand. [24] The nerves of the cervical plexus and brachial plexus can be affected. [25]
Spinal stenosis is an abnormal narrowing of the spinal canal or neural foramen that results in pressure on the spinal cord or nerve roots. [6] Symptoms may include pain, numbness, or weakness in the arms or legs. [1]
Klippel–Feil syndrome (KFS), also known as cervical vertebral fusion syndrome, is a rare congenital condition characterized by the abnormal fusion of any two of the seven bones in the neck (cervical vertebrae). [1]: 578 It can result in a limited ability to move the neck and shortness of the neck, resulting in the appearance of a low hairline ...