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. 2014 Sep 23;8:167. doi: 10.3389/fnsys.2014.00167

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Copyright © 2014 Salloum, Chen, Velet, Manzoor, Elkin, Kidd, Coughlin, Yurosko, Bou-Anak, Azadi, Gohlsch, Schneider and Kaltenbach.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Examples of axo-spinous synapses on apical dendrites showing active zones and postsynaptic densities (PSDs). (A–D) The axon terminal (T) abutting the spine (Sp) contained a single active zone with an associated cluster of docked vesicles (white arrows). The PSD appears as a dark shadow beneath the contact with the presynaptic terminal (T) of the spine. As in the terminals on the soma, the vesicle cluster associated with the active zone was an extension of a larger pool of vesicles that spread throughout and often filled much of the terminal. (E) Relationship between the active zone and PSD lengths of axo-spinous synapses. (F) Maximum length distribution of active zones of axo-spinous synapses. Data for (E) and (F) were obtained from a random sample of 57 synapses from the apical dendrites of three fusiform cells.