Spinal cord model: spinal nerve | spinal ganglion  | dorsal root | dorsal rootlets | ventral root.| ventral rootlets |  dura mater |  arachnoid |  subarachnoid space |  anterior(ventral)sulcus |   anterior spinal artery |   denticulate ligament |   ventral horn of gray matter |   dorsal horn of gray matter |  white matter.(some tracts are identified in next slide)