Sensory fibers of the posterior column pathway (Cuneatus and Gracilus) A. Enter the spinal cord and ascend ipsilaterally (on the same side) then crosses over in the medulla B. Cross over at the level of entry to the spinal cord and ascend contralaterally C. Enter the spinal cord and descend ipsilaterally to nuclei in the sacral region D. Include nerve fibers conducting pain and temperature sensations