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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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Ultrastructure and reconstruction of apical dendritic spines. (A) A single spine (Sp) completely surrounded by a single axo-spinous terminal (T). (B) An example of an axo-spinous terminal synapsing with two different spines (Sp1 and Sp2) of the same dendritic shaft (DS). (C) 3D-reconstruction of a segment of a secondary branch of an apical dendrite showing the stubby morphology of spines. DS, dendritic shaft. Sp, spine. (D) A mushroom spine (Sp1) is shown extending from the left side of the dendritic shaft (DS). (E) Two spines on the same dendrite showing the head and neck components of the spine. Note the terminal contacting Sp2 extended beyond the spine to contact the shaft.