Brain and spinal chord: Abbr., 3 letters
Brain and spinal cord, initially, 3 letters
Brain, spinal cord, etc., 3 letters
Brain, spinal cord, etc.: abbr., 3 letters
Brain/spinal cord combo, 3 letters
It includes the brain and spinal cord: abbr., 3 letters
Neurologist's concern: Abbr., 3 letters
Neurologist's subj., 3 letters
The brain and the spinal cord (abbr.), 3 letters
The portion of the vertebrate nervous system consisting of the brain and spinal cord, 3 letters