Book contents
- A Textbook of Clinical Embryology
- A Textbook of Clinical Embryology
- Copyright page
- Contents
- Frontispiece
- Chapter Co-authors
- Acknowledgments
- Section 1 Physiology of Reproduction
- Introduction
- Chapter 1 Development of Reproductive Systems at the Embryo Stage
- Chapter 2 Reproductive Puberty
- Chapter 3 Physiology of the Male Reproductive System
- Chapter 4 Physiology of the Female Reproductive System
- Chapter 5 Conception
- Section 2 Assisted Reproductive Procedures
- Section 3 Genetics and Preimplantation Genetic Testing
- Section 4 IVF Laboratory
- Index
- References
Chapter 1 - Development of Reproductive Systems at the Embryo Stage
from Section 1 - Physiology of Reproduction
Published online by Cambridge University Press: 05 March 2021
- A Textbook of Clinical Embryology
- A Textbook of Clinical Embryology
- Copyright page
- Contents
- Frontispiece
- Chapter Co-authors
- Acknowledgments
- Section 1 Physiology of Reproduction
- Introduction
- Chapter 1 Development of Reproductive Systems at the Embryo Stage
- Chapter 2 Reproductive Puberty
- Chapter 3 Physiology of the Male Reproductive System
- Chapter 4 Physiology of the Female Reproductive System
- Chapter 5 Conception
- Section 2 Assisted Reproductive Procedures
- Section 3 Genetics and Preimplantation Genetic Testing
- Section 4 IVF Laboratory
- Index
- References
Summary
The female and male reproductive tracts originate from the same embryonic/fetal tissue. The gonads and internal and external genitalia begin as bipotential tissues. The indifferent gonad consists of a medulla and cortex. Human female and male embryos develop in the same way for the first 6 weeks, regardless of genetic sex (46,XX or 46,XY karyotype) (Figure 1.1). The one way to tell the difference between 46,XX and 46,XY embryos during this time period is by looking for a Barr body (“inactive” one X chromosome) or a Y chromosome. The medulla of the XY embryo will develop into the testes and the cortex will regress. In the XX embryo, the ovary will originate from the cortex and the medulla will decline. A complete 46,XX chromosomal complement is necessary for normal ovarian development. The second X chromosome contains elements essential for ovarian development.
- Type
- Chapter
- Information
- A Textbook of Clinical Embryology , pp. 3 - 7Publisher: Cambridge University PressPrint publication year: 2021