Ultra-realistic medical visualization of the human upper body in partial sagittal cross-section, showing the brain seamlessly connected to the spinal cord within the vertebral column. Focus on the motor cortex at the top of the frame, where a single localized electrical impulse forms within motor neurons. Axons are clearly traced downward from the cortex into the brainstem and spinal cord, physically embedded within the surrounding skull, vertebrae, and soft tissue. The spinal cord continues downward out of frame, establishing a clear anatomical pathway toward peripheral nerves. Neural structures are sharply defined, biologically scaled, and spatially continuous