Swellings termed axonal varicosities / boutons are typically the sites where synapses occur. Boutons form as terminal bulbs at the end of an axon, and/or along the length of individual axons as boutons en passant (see diagram left).

Axon terminals (also called terminal boutons, synaptic boutons, end-feet, or presynaptic terminals) are distal terminations of the branches of an axon.

May 22, 2020 · The axon terminal, also known as the synaptic bouton and terminal bouton, is the most distal portion of a neuron’s axon and is critical for neural communication. When action potentials reach the axon terminal, calcium floods the neuron, allowing synaptic vesicles to fuse with the membrane and release stored neurotransmitters to target cells.

May 29, 2023 · An axon terminal is any of the button-like endings of axons through which axons make synaptic contacts with other nerve cells or with effector cells. At the axon terminal, synaptic vesicles containing neurotransmitters are docked.

Mar 16, 2006 · We have used advances in axon labeling by viruses and in vivo two-photon microscopy to investigate axon branching and bouton dynamics in primary visual cortex (V1) of adult Macaque monkeys.

Some synaptic junctions appear along the length of an axon as it extends; these are called en passant boutons ("in passing boutons") and can be in the hundreds or even the thousands along one axon. [3] Other synapses appear as terminals at the ends of axonal branches.

We investigated how often the axon creates boutons with two junctions by examining the 230 synaptic boutons (Fig. 7D). The postsynaptic structures of the synaptic boutons were somata ( n = 20), dendritic shafts ( n = 147), and spines ( n = 74).

Oct 23, 2024 · Structure of Axon Terminals. The architecture of axon terminals is a fascinating aspect of neuronal anatomy, characterized by its specialized design to facilitate communication. At the distal end of an axon, these terminals are often …

Nov 19, 2001 · En passant or terminaux boutons did not differ in the proportion of synapses they formed with dendritic spines and shafts, and thus, the two morphological variants of synaptic bouton do not...

Feb 5, 2025 · The axon terminal, or synaptic bouton, is a specialized structure at the end of an axon that facilitates neuronal communication. It is filled with synaptic vesicles, small membrane-bound sacs containing neurotransmitters essential for synaptic transmission.