The Collaborative International Dictionary of English v.0.48:

Neural \Neu"ral\, a. [Gr. ney^ron nerve.] (Anat. & Zool.)
   relating to the nerves or nervous system; taining to,
   situated in the region of, or on the side with, the neural,
   or cerebro-spinal, axis; -- opposed to hemal. As applied to
   vertebrates, neural is the same as dorsal; as applied to
   invertebrates it is usually the same as ventral. Cf. Hemal.
   [1913 Webster]

   Neural arch (Anat.), the cartilaginous or bony arch on the
      dorsal side of the centrum of the vertebra in a segment of
      the spinal skeleton, usually inclosing a segment of the
      spinal cord.
      [1913 Webster]

WordNet (r) 3.0 (2006):

neural arch
    n 1: a structure arising dorsally from a vertebral centrum and
         enclosing the spinal cord [syn: neural arch, vertebral
         arch]