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. 2019 Aug 16;10:895. doi: 10.3389/fneur.2019.00895

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Copyright © 2019 Noble, Liu, Matthews, Schulte and Lang.

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) and the copyright owner(s) 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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IBA1⁺ macrophages located in the auditory nerve demonstrate spatially-dependent alterations in morphology. These images from the auditory nerve (AN) of an 87-year-old donor (H33) demonstrate region-dependent changes in macrophage morphology. IBA1⁺ macrophages in the middle turn (A) have an elongated spiral shape (arrows) whereas many cells in the basal turn (B) extend numerous short cellular projections (arrowheads), although there is no evidence supporting a robust loss of β-Tubulin⁺ SGNs (C,D), which appear in the same area of the AN. An inserted black and white image in the bottom-left of (A) shows the location of the AN in the cochlea. Scale bar in (B) applies to (A) = 20 μm; in (D) applies (C) = 20 μm.