In the sensory system, a synapse is a structure that allows a neuron (or nerve cell) to pass an electrical or substance sign to another neuron or to the objective effector cell. ynapses are basic to neuronal capacity, neurons are cells that are particular to pass signs to singular objective cells, and neurotransmitters are the methods by which they do as such. At a neurotransmitter, the plasma film of the sign passing neuron (the presynaptic neuron) comes into close juxtaposition with the layer of the objective (postsynaptic) cell. Both the presynaptic and postsynaptic locales contain broad varieties of sub-atomic apparatus that connect the two layers together and complete the flagging procedure. In numerous neural connections, the presynaptic part is situated on an axon and the postsynaptic part is situated on a dendrite or soma. Astrocytes likewise trade data with the synaptic neurons, reacting to synaptic action and, thus, controlling neurotransmission.