Propulsive nerve ending/synapse

Excitatory boutong/synapse

Irritating Nerve Ending, Synapse, Excitation, Excitation

A pushing, teasing synapse is also called an "excitatory synapse". Excitatory / excitatory in this context means that the synaptic activity increases the possibility/probability that a nerve impulse/action potential will be triggered in the initial axon segment (IS) of the postsynaptic neuron and then, via the axon and all its branches, spread out to the boutongs/nerve endings.

More than half of the synapses on an average neuron are excitatory. In the visual cortex, for example, it has been calculated that just over 80% of synapses are excitatory.
Excitatory synapses are common on the dendrites and especially adjacent to the dendrite tags.

Nerve endings/boutons that form excitatory synapses, synapses of "Type I", contain in the pronounced case round/spherical synapse vesicles. Furthermore, the postsynaptic membrane in excitatory synapses is significantly thicker than that in inhibitory synapses.

Glutamate is the most common excitatory transmitter substance.