What do you call the gap between two neurons of which the neurotransmitter crosses so as to stimulate the nerve impulse to start in the next dendrite?

The gap between two neurons is called the synapse. Neurotransmitters are released from the presynaptic neuron and cross this synaptic cleft to bind to receptors on the postsynaptic neuron, thereby triggering a nerve impulse in the next neuron. This process is essential for communication within the nervous system.