What body parts are affected by c4 and c5?

The C4 and C5 cervical vertebrae are part of the spinal cord and primarily affect the neck, shoulders, and upper arms. Damage or injury at these levels can impact motor and sensory functions in the diaphragm, which is crucial for breathing, as well as impair arm and shoulder movement. Additionally, it may lead to weakness or paralysis in the corresponding areas, depending on the severity of the injury.