Synaptic vesicles are small, membrane-bound sacs found in the nerve terminals of neurons. They store neurotransmitters, which are chemical messengers that transmit signals between neurons. When a nerve impulse reaches the terminal, these vesicles fuse with the cell membrane, releasing their contents into the synaptic cleft, the gap between neurons. The release of neurotransmitters from synaptic vesicles is crucial for communication in the nervous system. This process allows signals to be passed from one neuron to another, influencing various functions such as muscle contraction, mood regulation, and cognitive processes. Proper functioning of synaptic vesicles is essential for overall brain health.