Fill in the blank with the appropriate word. ResetHelp The conducts impulses toward the soma. The conducts impulses toward the synaptic terminals. The is the region surrounding the nucleus. The is the enlarged end of an axon. The contains neurotransmitters. The is a cluster of RER and free ribosomes. The is another term for the soma of a neuron. The is the membrane of the axon. The is a cell that forms the blood 13brain barrier. The is a fine branch of an axon.