Effect of intrathecal FA administration on GFAP-positive cells in the Vc of IANX rats. A, C, Low-magnification photomicrographs of GFAP-positive cells in Vc following intrathecal administration of vehicle (isotonic saline) (A) or that after FA administration (C) in IANX rats 7 d after IAN transection. B, D, High-magnification photomicrograph of the Vc innervated by the third branch of the trigeminal nerve in the intrathecal vehicle (isotonic saline)-administrated rat (B) and FA-administrated rat (D). E, Relative area occupied by GFAP-positive cells in Vc innervated by the second and third branches of the trigeminal nerve in IANX rats. *p < 0.05.