Which level of spinal cord injury (C3) is characterized by movement in the chin and neck?

In the context of spinal cord injuries, a level of injury at C3 indicates that the injury occurs at the third cervical vertebra. Individuals with a C3 spinal cord injury typically retain some movement in the neck and chin. The motor function at this level is primarily characterized by the ability to move the head and neck, including chin movement, due to the innervation of the neck muscles.

While other levels such as C2, C4, and C5 would demonstrate specific movement capabilities, a C3 injury is particularly noted for the ability to flex and extend the neck and make movements with the chin. This movement capacity is due to the spinal nerves that emerge from the C3 level, which supply the muscles that facilitate these actions.

For instance, an injury at C2 may allow only limited neck movement, whereas C4 and C5 injuries would typically include more extensive movements in the upper limbs and shoulders as they involve different muscle innervations and resulting functional capabilities. Thus, the description of movement in the chin and neck aligns perfectly with the characteristics of a C3 spinal cord injury.