The cervical spinal cord is the upper part of the spinal cord, inside the neck. It carries signals between the brain and much of the body, including pathways involved in controlling the arms, hands, trunk and legs, and some functions connected with breathing.
An injury to this region can interrupt signals traveling between the brain and muscles. The effects depend on the level and completeness of the injury. Some people retain limited arm or hand movement; others have extensive paralysis. Sensation and autonomic functions can also be affected.
This matters for brain-computer interface research because neural activity related to intended movement may remain measurable even when a spinal cord injury prevents the movement itself. A BCI can sometimes translate those signals into computer commands or connect to assistive technology, without repairing the injured spinal cord.
In a clinical report, note the precise injury level, completeness, functional abilities and any rehabilitation or other technology used with the BCI. Those details help explain what a successful demonstration means and who else might benefit.