Neuronal cell loss. There is no difference in the total number of Nissl+ cells in the (A) caudate, (B) SN, substantia nigra, (C) superior colliculus (SC), or (D) cranial nerve III/IV (CNIII/IV) between sham, single, or repetitively injured animals 15 min after injury. Error bars ± standard error of the mean. Color image is available online.