Figure 38. Diagrammatic representation

of the symptoms that result from acute destruction of the anterior cornua of the spinal cord.—(Bramwell.)
On the left side the destruction of the nerve-cells is complete; the anterior nerve-roots, motor nerve-fibers, and the muscles which they supply are all degenerated; there is a total "block" to the passage of voluntary motor and reflex motor impulses. On the right side two-thirds of the motor cells are destroyed; two-thirds of the muscular area connected with the right anterior cornu are degenerated and atrophied: one-third (M) remains healthy, and can be made to contract by voluntary or reflex motor impulses. (Lockwood.)

This image is from Anterior Poliomyelitis. in Thomas' Eclectic Practice of Medicine.