Foetal Development
Last updated: Tuesday, September 15, 2009 Print
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Week 1 - 4 By week 4, the embryo is curled into an arc of about 4 mm across. There are signs of early development of the neural tube, which contains the spinal cord, and the tubular structure of the embryo's body has started to form. The two tubes of the heart fuse and start contracting and the neural tube zips itself shut. |
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