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Implantation Well Underway

8 days

Buy NowFrom The Biology of Prenatal Development.

Label Key:

  • 1. trophoblast cells
  • 2. inner cell mass
  • 3. decidual reaction (site of early placenta formation)
  • 4. inner lining of uterine wall (endometrium), seen in cross-section
  • 5. muscle layer of uterine wall (myometrium)
  • 6. uterine cavity

All ages referenced to fertilization, not last menstrual period.
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Implantation Well Underway
Implantation Well Underway
Embryo Cross Section 8-9 Days
Embryo Cross Section 8-9 Days
Embryo at About 11 Days
Embryo at About 11 Days
Tube Shaped Heart
Tube Shaped Heart
Three-Week Embryo
Three-Week Embryo
Left Lateral View: 3-Week Embryo
Left Lateral View: 3-Week Embryo
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