Antigens, CD; Antigens, Neoplasm; Antigens, Surface; Avian Proteins; Blood Proteins; Chemotaxis, Leukocyte/physiology; Gliosis/pathology; Macrophages/cytology; Microglia/cytology; Myelitis/pathology; Spinal Cord Injuries/pathology; Animals; Axons/drug effects; Axons/metabolism; Axons/pathology; Basigin; Chemotaxis, Leukocyte/drug effects; Denervation/methods; Disease Models, Animal; Female; Gait Disorders, Neurologic/chemically induced; Gait Disorders, Neurologic/pathology; Gait Disorders, Neurologic/physiopathology; Gliosis/chemically induced; Gliosis/physiopathology; Immunohistochemistry; Macrophages/drug effects; Macrophages/metabolism; Membrane Glycoproteins/metabolism; Microglia/drug effects; Microglia/metabolism; Microinjections; Myelin Sheath/drug effects; Myelin Sheath/metabolism; Myelin Sheath/pathology; Myelitis/chemically induced; Myelitis/physiopathology; Nerve Degeneration/chemically induced; Nerve Degeneration/pathology; Nerve Degeneration/physiopathology; Nerve Fibers, Myelinated/drug effects; Nerve Fibers, Myelinated/pathology; Rats; Rats, Sprague-Dawley; Spinal Cord/drug effects; Spinal Cord/pathology; Spinal Cord/physiopathology; Spinal Cord Injuries/physiopathology; Zymosan/pharmacology