Synaptic Vesicles

**Definition:** Membrane-bound compartments which contain transmitter molecules. Synaptic vesicles are concentrated at presynaptic terminals. They actively sequester transmitter molecules from the cytoplasm. In at least some synapses, transmitter release occurs by fusion of these vesicles with the presynaptic membrane, followed by exocytosis of their contents.

**Tree numbers:** - A08.850.840 - A11.284.430.214.190.875.190.880.810.750