Embryogenesis

1. Front Matter

   Pages I-IX

   PDF

2. Preliminary Definitions

   • H. Tuchmann-Duplessis, G. David, P. Haegel

   Pages 1-1

3. Gametogenesis

   • H. Tuchmann-Duplessis, G. David, P. Haegel

   Pages 2-7

4. Phenomena of Fertilization

   • H. Tuchmann-Duplessis, G. David, P. Haegel

   Pages 8-9

5. Preparation for Implantation

   • H. Tuchmann-Duplessis, G. David, P. Haegel

   Pages 10-13

6. First Week of Development

   • H. Tuchmann-Duplessis, G. David, P. Haegel

   Pages 14-17

7. Second Week: Formation of the Embryonic Disc

   • H. Tuchmann-Duplessis, G. David, P. Haegel

   Pages 18-19

8. Third Week: Gastrulation

   • H. Tuchmann-Duplessis, G. David, P. Haegel

   Pages 20-27

9. Destiny of the Three Germ Layers

   • H. Tuchmann-Duplessis, G. David, P. Haegel

   Pages 28-29

10. Development of the Ectoderm: Neurulation

    • H. Tuchmann-Duplessis, G. David, P. Haegel

    Pages 30-33

11. Development of the Mesoderm

    • H. Tuchmann-Duplessis, G. David, P. Haegel

    Pages 34-41

12. Development of the Entoderm

    • H. Tuchmann-Duplessis, G. David, P. Haegel

    Pages 42-45

13. Flexion

    • H. Tuchmann-Duplessis, G. David, P. Haegel

    Pages 46-47

14. Flexion in Cross Section

    • H. Tuchmann-Duplessis, G. David, P. Haegel

    Pages 48-51

15. Flexion in Longitudinal Section

    • H. Tuchmann-Duplessis, G. David, P. Haegel

    Pages 52-53

16. Development of Fetal Membranes

    • H. Tuchmann-Duplessis, G. David, P. Haegel

    Pages 54-61

17. The Placenta: Morphology

    • H. Tuchmann-Duplessis, G. David, P. Haegel

    Pages 62-73

18. The Placenta: Physiology

    • H. Tuchmann-Duplessis, G. David, P. Haegel

    Pages 74-85

19. Twins

    • H. Tuchmann-Duplessis, G. David, P. Haegel

    Pages 86-87

20. Principal Stages of Development

    • H. Tuchmann-Duplessis, G. David, P. Haegel

    Pages 88-91

MBRYOLOGY studies the succession of transformations undergone by the fertilized E egg in the formation of a new individual. Development of the embryo is directed by morphogenetic mechanisms ruled by a strict chronology. Survival of the egg, its transport in the genital tract, and the adaptation of the maternal orga­ nism to its presence are controlled by hormonal actions. Knowledge of these subjects is proving to be increasingly important for the medical practitioner. Such information helps to explain anatomic correlations; organ relation­ ships also illuminate the etiology of numerous pathologic conditions. Disturbances of prenatal development engender congenital malformations and constitute an important cause of perinatal mortality and postnatal morbidity. Our goal in preparing Volume I was to introduce the student to the complex pheno­ mena of embryonic development in a clear and direct way. We tried to present an overall view of the simultaneous nature of the multiple and rapid events in embryogenesis. Also, we thought it appropriate to treat certain topics in depth, becallse of their difficulty, or their physiological or pathological implications. Thus, gastrulation and formation of the body shape, including flexion, which are par­ ticularly dynamic processes, can best be understood by following their sequences in detail. Special attention '}Jas also devoted to the placenta, since it assures the functions of nutrition, respiration, and excretion. It is also an endocrine gland upon which the hor­ monal equilibrium of pregnancy depends.

• development
• embryo
• embryology
• nutrition

• University of Paris Medical School, Paris, France

  H. Tuchmann-Duplessis, G. David

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