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. 2017 Dec 4;11:112. doi: 10.3389/fnana.2017.00112

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Copyright © 2017 Larsen.

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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“The total number of cells in billions (10⁹) in three major developmental zones of the human fetal forebrain (B,C,D) (CP/MZ, SP, IZ) and in the summation of all four zones (A) (CP/MZ, SP, IZ, VZ/SVZ), representing the total number of cells in the entire human fetal forebrain. The material has been allocated into two study periods: one from 13 to 20 weeks of gestation and another from 22 weeks of gestation to term. Due to the limited number of cases during the period from 18 to 22 weeks of gestation, we could not determine which of the two mathematical models that gave the best fit in that transitional interval.” Reproduced with permission from Samuelsen et al. (2003).