A1a11

Figure 7 Neurogenesis in the grasshopper central nervous system (CNS). (A) Schematic diagram of a 30% grasshopper embryo (hatching occurs at 100%) showing the segmental structure of the ectoderm. The middle of the ectoderm is a longitudinal strip of neuroepithelium that gives rise to the CNS. The location of the neuronal precursor cells for a single segment (A4) are drawn in black. (B) Pattern of neuroblastomas (NBs) for a single segment (A4) includes two plates of 30 NBs arranged in a precise pattern of seven rows and one median neuroblastoma (MNB), for a total of 61 NBs. (C) Cell lineage of two identified serotonin immunoreactive neurones, S1 and S2, from NBs 7-3. NBs generate neuronal progeny by a series of asymmetric cell divisions that produce small, ganglion mother cells. Ganglion mothers cells then each divide once more symmetrically to produce two cells that will both differentiate into neurons. The cell lineage is represented with a ganglion mother cell closest to the NB and older neuronal progeny lying progressively farther away from the NB. (D) The cell-specific morphologies of neurons S1 (top) and S2 (bottom) in the A4 ganglion at 70% embryonic development, as revealed by intracellular injection of Lucifer Yellow followed by HRP immunocytochemistry with an anti-Lucifer Yellow antibody (reproduced with permission from Macmillan Journals Ltd).

Figure 7 Neurogenesis in the grasshopper central nervous system (CNS). (A) Schematic diagram of a 30% grasshopper embryo (hatching occurs at 100%) showing the segmental structure of the ectoderm. The middle of the ectoderm is a longitudinal strip of neuroepithelium that gives rise to the CNS. The location of the neuronal precursor cells for a single segment (A4) are drawn in black. (B) Pattern of neuroblastomas (NBs) for a single segment (A4) includes two plates of 30 NBs arranged in a precise pattern of seven rows and one median neuroblastoma (MNB), for a total of 61 NBs. (C) Cell lineage of two identified serotonin immunoreactive neurones, S1 and S2, from NBs 7-3. NBs generate neuronal progeny by a series of asymmetric cell divisions that produce small, ganglion mother cells. Ganglion mothers cells then each divide once more symmetrically to produce two cells that will both differentiate into neurons. The cell lineage is represented with a ganglion mother cell closest to the NB and older neuronal progeny lying progressively farther away from the NB. (D) The cell-specific morphologies of neurons S1 (top) and S2 (bottom) in the A4 ganglion at 70% embryonic development, as revealed by intracellular injection of Lucifer Yellow followed by HRP immunocytochemistry with an anti-Lucifer Yellow antibody (reproduced with permission from Macmillan Journals Ltd).

Neuroepithelial cell of optic stalk

Type-1 astrocyte percursor

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