File:Stage22 HPA2L.jpg

From Embryology

Stage22_HPA2L.jpg(603 × 399 pixels, file size: 82 KB, MIME type: image/jpeg)

Human Embryo Carnegie stage 22

  • Section through the head/brain region of the developing cortex.
  • Small region from entire cross-section of the stage 22 embryo head shown in high power.
Detailed Image  
Stage 22 image 217.jpg

Cortex Development

  • Ventricular layer (stem cells) proliferate.
    • mitosis
  • Differentiating cells migrate away from ventricular layer.
    • migrate along radial glial cells.
  • Migrating cells stop at the region where the cortex will form.
  • Cells are layered from the inside outwards.


  • all layers between ventricular and developing cortex are only developmental structures.
  • Neurons are formed first, glia are formed later.
  • Adult - ventricular layer lines the ventricles and appears to still contain some neural stem cells.

Links: Neural System Development | Stem Cells

File history

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current15:22, 10 August 2009Thumbnail for version as of 15:22, 10 August 2009603 × 399 (82 KB)MarkHill (talk | contribs) Original File name: HUMHPA2L.GIF