What is the terminal button?

The terminal button, also known as the synaptic bouton, is the bulge at the end of an axon that makes contact with the next neuron in the transmission of nerve impulses. This structure plays a crucial role in neurotransmission, as it contains synaptic vesicles filled with neurotransmitters, which are released into the synaptic cleft when a nerve impulse reaches the terminal button. This release enables the transmission of signals from one neuron to another, facilitating communication throughout the nervous system.

The other options describe different components or functions of the nervous system, but they do not accurately define the terminal button. The part of a neuron that generates impulses refers to the axon hillock, not the terminal button. The space between two neurons is called the synaptic cleft, which is distinct from the terminal button itself. Finally, a structure that conducts nerve impulses generally describes the axon, which carries electrical signals away from the neuron's cell body, rather than the terminal button, which is involved in signal transmission rather than conduction.