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. 2017 Aug 15;11:76. doi: 10.3389/fncom.2017.00076

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Copyright © 2017 Razavi, Zhang, Chen, Li, Platt, Zhao, Guo, Hu, Wang and Liu.

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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(a) A coronal T1-weighted MRI section of the 21 pcw fetal brain. The blue frame highlights the location of the calcarine sulcus; (b) Tractography fibers extracted from the calcarine sulcus. Arrow #1 indicates radial structure composed of RGCs and neuronal axons, coursing along the sulcal regions; (c) A transverse T1-weighted MRI section of the 21 pcw fetal brain. The green frame highlights the location of the parieto-occipital sulcus; (d) Tractography fibers extracted in the parieto-occipital sulcal regions. The green arrow highlights the sulcal fundus location on the cortical surface. Arrow #2 highlights RGCs. Arrow #3 indicates the radial structure, a mixture of RGC and neuronal axon. Arrow #4 highlights the parallel fibers beneath the sulcal fundus. White curves indicate the cortical plate boundaries.