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Embryology and Anatomy of the First Trimester
Anne Kennedy, MD
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TERMINOLOGY

  • Definitions

    • 1st trimester covers time from 1st day of last menstrual period to end of 13th postmenstrual week

EMBRYOLOGY

  • Embryologic Events

    • Ovulation

      • Fertilization

        • Cleavage

          • Implantation

            • Embryonic Development

              • Organogenesis

                • Placental Development

                  • Umbilical Cord Development

                    ANATOMY IMAGING ISSUES

                    • Questions

                      Selected References

                      1. AIUM practice parameter for the performance of detailed diagnostic obstetric ultrasound examinations between 12 weeks 0 days and 13 weeks 6 days. J Ultrasound Med. 40(5):E1-16, 2021
                      2. Wang PS et al: Ultrasound of the first trimester. Radiol Clin North Am. 57(3):617-33, 2019
                      3. Morin L et al: Ultrasound evaluation of first trimester complications of pregnancy. J Obstet Gynaecol Can. 38(10):982-8, 2016
                      4. Doubilet PM et al: Diagnostic criteria for nonviable pregnancy early in the first trimester. N Engl J Med. 369(15):1443-51, 2013
                      5. Barnhart K et al: Pregnancy of unknown location: a consensus statement of nomenclature, definitions, and outcome. Fertil Steril. 95(3):857-66, 2011
                      Related Anatomy
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                      Related Differential Diagnoses
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                      References
                      Tables

                      Tables

                      TERMINOLOGY

                      • Definitions

                        • 1st trimester covers time from 1st day of last menstrual period to end of 13th postmenstrual week

                      EMBRYOLOGY

                      • Embryologic Events

                        • Ovulation

                          • Fertilization

                            • Cleavage

                              • Implantation

                                • Embryonic Development

                                  • Organogenesis

                                    • Placental Development

                                      • Umbilical Cord Development

                                        ANATOMY IMAGING ISSUES

                                        • Questions

                                          Selected References

                                          1. AIUM practice parameter for the performance of detailed diagnostic obstetric ultrasound examinations between 12 weeks 0 days and 13 weeks 6 days. J Ultrasound Med. 40(5):E1-16, 2021
                                          2. Wang PS et al: Ultrasound of the first trimester. Radiol Clin North Am. 57(3):617-33, 2019
                                          3. Morin L et al: Ultrasound evaluation of first trimester complications of pregnancy. J Obstet Gynaecol Can. 38(10):982-8, 2016
                                          4. Doubilet PM et al: Diagnostic criteria for nonviable pregnancy early in the first trimester. N Engl J Med. 369(15):1443-51, 2013
                                          5. Barnhart K et al: Pregnancy of unknown location: a consensus statement of nomenclature, definitions, and outcome. Fertil Steril. 95(3):857-66, 2011