The |spinal nerves| pass through the meninges of the |spinal cord| and into the main canal at ~anterior~ and ~posterior~ junctures along the |spinal cord|. The ~anterior~ (front) roots or these ~nerves~ are the efferent ~nerves~, which convert impulses from the |spinal cord| to the muscles and other organs. The ~posterior~ ~nerve~ roots are for afferent ~nerves~, which carry ~nerve~ impulses back to the |spinal cord| from the sense organs.