context: Neurotransmitters are in the synaptic vesicles of neurons. When stimulation is transmitted to nerve cells, calcium ion channels are opened before neuronal synapses, and calcium is introduced into the neurons to move synaptic vesicles into the cell membranes of the neurons. The vesicles that migrate to the cell membrane release neurotransmitters to synapses by extracellular leakage at the axon ends. The released neurotransmitter binds to receptors on the postsynaptic cell membrane to change the permeability of postsynaptic cells. If the cation channel is opened and the cation enters the neuron, the neuron depolarizes to deliver the excitatory nerve, and if the anion channel is opened, the neuron is hyperpolarized to inhibit neurotransmission.
question: Where are neurotransmitters located in neurons?
answers.text: synaptic vesicles