going before another in time or order I'd like to follow up on an antecedent question from another reporter Synonyms previous, anterior, foregoing, former, precedent, preceding, priorRelated Words advance, early, premature; earliest, first, inaugural, initial, maiden, original, pioneer; preexisting; introductory, preliminary; erstwhile, whilomNear ...
Neurotransmitters are formed in a presynaptic neuron and stored in small membrane-bound sacks, called vesicles, inside this neuron. When this neuron is activated, these intracellular vesicles fuse with the cell membrane and release their contents into the synapse, a process called exocytosis.
1 Storage of the neurotransmitter in storage granules or vesicles in the axon terminal. 2  Calcium enters the axon terminal during an action potential, causing release of the neurotransmitter into the synaptic cleft.otransmission is the release of several types of neurotransmitters from a single nerve terminal. At the nerve terminal, neurotransmitters are present within 35â50 nm membrane-encased vesicles called synaptic vesicles.