File:Stage15 embryo and brain 01.jpg

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Human Embryo Carnegie Stage15 and Neural Tube Model

The embryo and how the brain and spinal cord appears during week 5 after fertilisation (Gestational Age - GA week 7). The associated detailed description below is not part of the K12 presentation.


  • Left - surface view of a human embryo Week 5.
  • Right - model of neural tube surface appearance at this time and viewed also from the same direction. Note the overall tube shape and bending along its length. The neural tube is still a thin-walled tube and is mainly a fluid-filled sac.


Brain and Neural Tube Links: K12 Brain Awareness Week | Week 5 | Week 6 | Week 8 | Neural Development


Gestational Age - is the clinical staging term of human development measured from the last menstrual period (indicating when the mother was not pregnant) not from fertilisation (about the time of ovulation of the next cycle).


Stage 15 Links: Week 5 | Head | Lecture - Limb | Lecture - Gastrointestinal | Lecture - Head Development | Science Practical - Gastrointestinal | Science Practical - Head | Carnegie Embryos | Category:Carnegie Stage 15 | Next Stage 16
  Historic Papers: 1891 | 1905 Cranial and Spinal Nerves | 1914 | 1926 Precervical Sinus | 1948 stages 15-18


Week: 1 2 3 4 5 6 7 8
Carnegie stage: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23


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