Fig. 2. Histograms of neurologic (Tarlov) score and the total number of viable motoneurons in the ventral horn per animal in the four treatment groups. The number of motoneurons is shown at the left of each diagram, and neurologic score is shown at the right of each diagram. Neurologic score: 0, paraplegic with no lower-extremity function; 1, poor lower-extremity function, weak antigravity movement only; 2, some lower-extremity motor function with good antigravity strength but inability to draw legs under body or hop; 3, ability to draw leg under body and hop but not normally; 4, normal motor function. C = control; K = ketamine; R = riluzole; RK = riluzole plus ketamine; viable MN = total number of viable motoneurons in the ventral horn.