you wish to place the selected answer into. Press the key again to "drop" the answer choice into the response container. : Meninges : Neurological three membranes which envelop the brain and spinal cord; cerebral spinal fluid is located between these layers square : Neurons square related to disorders of the nervous system : Prions Specified Risk Material abnormal, pathogenic agent which may cause normal proteins in organs, commonly the brain, to fold abnormally and cause diseases square Transmissible Spongiform Encephalopathy nerve cells which communicate with other cells via synapses square various tissues of ruminant animals which cannot be consumed by other animals or humans due to possible infection square rare, degenerative brain diseases caused by prions square