Brain Tissue Transplantation/methods; Immunosuppressive Agents/therapeutic use; Myelin Sheath/transplantation; Nerve Regeneration/physiology; Neuroglia/transplantation; Spinal Cord Injuries/surgery; Tacrolimus/therapeutic use; Analysis of Variance; Animals; Brain Tissue Transplantation/immunology; Cells, Cultured; Combined Modality Therapy; Disease Models, Animal; Evoked Potentials, Motor/drug effects; Evoked Potentials, Motor/physiology; Female; Motor Activity/drug effects; Motor Activity/physiology; Myelin Sheath/drug effects; Myelin Sheath/immunology; Nerve Regeneration/drug effects; Neuroglia/cytology; Neuroglia/drug effects; Neuroglia/immunology; Olfactory Bulb/cytology; Rats; Recovery of Function/drug effects; Recovery of Function/physiology; Spinal Cord Injuries/drug therapy; Spinal Cord Injuries/immunology; Statistics, Nonparametric