A. Synapses (this is the gap between two nervous system cells)
B. Lesion (this is essentially a part of tissue that has been damaged)
C. Lobe (this can mean several different things, such as a brain lobe, which are simply different sections of a brain. )
D. Neuron (the name of the cell of the nervous system)
Hope this helped!
~Just a girl in love with Shawn Mendes