Sentence:  I found a trooper once the Apache had spread-eagled on an ant hill , and another time we ran across some teamsters they 'd caught , tied upside down on their own wagon wheels over little fires until their <WSD>brains</WSD> was exploded right out o ' their skulls . 
Meaning of the word marked with <WSD> tags:  that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord