At the terminal end of the axon is a branched structure with ends called synaptic knobs. From this structure chemical signals can be sent to neighboring neurons. Transmission of nerve impulse along the axon
When an action potential reaches the axon terminal of a motor neuron, vesicles carrying neurotransmitters (mostly acetylcholine) are exocytosed and the contents are released into the neuromuscular junction.These neurotransmitters bind to receptors on the postsynaptic membrane and lead to its depolarization.he small depolarization associated with the release of acetylcholine from one synaptic vesicle is called a miniature end-plate potential (MEPP). MEPPs are additive and lead to a greater depolarization of the postsynaptic membrane and become end plate potentials (EPPs).
Transmission of Action Potentials from One Neuron to Another. When an electrical impulse reaches the end of an axon, it may be transmitted across the synaptic junction to the end of the next axon by a chemical. Less commonly, electrical synapses occur; these are discussed in your textbook. Located in the synaptic vesicles on the ends of axons is a chemical given the general name of neurotransmitter substance.