Human Embryology 101

  • Picture of 24 day old fetusFetal heart begins to form 18 days after conception

  • Measurable heart beat 21-24 days after conception

  • Picture of 6 week old fetusFetal brain begins to form on day 25

  • Brain waves produced by 6 weeks
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Slide 11 of 49

Milestones of human development begin early. For example, the human heart beings to form 18 days after conception and exhibits a measurable heart beat at 21-24 days.1 The brain begins to form at this time2 and produces measurable brain waves at day 40.3

References Top of page

  1. Heart Development at the Loyola University Chicago web site

  2. "Life Before Birth" Life Magazine Educational Reprint 27, April 30, 1965, page 6.
    and Week 4 at the Loyola University Chicago web site

  3. Brain development slideshow at Temple University 


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