Neurologic vocabulary is not a list to memorise — it is a small set of roots multiplied by a small set of suffixes. Pick a prefix, a root and a suffix from the banks below and the term assembles itself, with the combining vowel deciding on its own whether it stays or disappears. Work the challenge prompts, and watch encephal/o give you encephalitis and encephalopathy without your having to memorise either spelling.
Prefix optional — how much, where, how badly
Root the structure or function involved
Suffix what is happening to it
What you just forged
Pick a root and a suffix to begin
prefixrootcombining vowelsuffix A gold o means the vowel survived; a struck-through o means the suffix started with a vowel and pushed it out.