What does the Bell-Magendie law state about spinal roots?

The Bell-Magendie law describes the functional differences between the dorsal and ventral roots of spinal nerves, emphasizing how they relate to sensory and motor functions. According to this law, the dorsal roots are responsible for transmitting sensory information from the body to the central nervous system, while the ventral roots are responsible for carrying motor commands from the central nervous system to the muscles.

The correct answer accurately summarizes this information by stating that dorsal roots are associated with indicating pain (as they carry sensory information, which can include pain signals) and that ventral roots control movement (reflecting their role in motor function). This encapsulation aligns with the fundamental understanding of how the spinal roots function, thus illustrating the essential principles described by the Bell-Magendie law.