BGDB Practical - Sexual Differentiation: Difference between revisions
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The endpoint of development could be considered the post-puberty active reproductive system. Interestingly, recent research is pointing to a link between neural and reproductive systems in how male and female brains may differentially develop under the influence of sex hormones and perhaps even the sex chromosomes. | The endpoint of development could be considered the post-puberty active reproductive system. Interestingly, recent research is pointing to a link between neural and reproductive systems in how male and female brains may differentially develop under the influence of sex hormones and perhaps even the sex chromosomes. | ||
==Genital Timeline== | |||
24 days - intermediate mesoderm, pronephros primordium | |||
28 days - mesonephros and mesonephric duct | |||
35 days - uteric bud, metanephros, urogenital ridge | |||
42 days - cloacal divison, gonadal primordium (indifferent) | |||
49 days - paramesonephric duct, gonadal differentiation | |||
56 days - paramesonephric duct fusion (female) | |||
100 days - primary follicles (ovary) | |||
==Textbooks== | ==Textbooks== |
Revision as of 19:44, 29 May 2011
Introduction
Practical 12: Sex Determination | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | 2011 Audio |
This practical will introduce the topic of sexual differentiation during development through a series of online resource pages.
Aim: This practical is an introduction to the earliest events in Sexual Differentiation.
Key Concepts: Primordial germ cells, gonad, internal genitalia, external genitalia, ovary, testes, puberty, hormonal changes, gametogenesis, abnormalities.
Background
Two key systems, neural and reproductive, develop over an extended period from the early embryo to puberty and the emerging adult. The genital system is closely linked developmentally to the urinary system, often called the urogenital system. This practical will therefore also briefly cover early development of the renal system.
In understanding embryonic sexual development, think of a cascade of sequence dependent events that transform indifferent gonads, internal and external genitalia into distinct male and female structures. The process begins with gonad differentiation, which itself is tied developmentally back at the initial event of fertilization and the presence of either a Y or X chromosome in the sperm.
The endpoint of development could be considered the post-puberty active reproductive system. Interestingly, recent research is pointing to a link between neural and reproductive systems in how male and female brains may differentially develop under the influence of sex hormones and perhaps even the sex chromosomes.
Genital Timeline
24 days - intermediate mesoderm, pronephros primordium
28 days - mesonephros and mesonephric duct
35 days - uteric bud, metanephros, urogenital ridge
42 days - cloacal divison, gonadal primordium (indifferent)
49 days - paramesonephric duct, gonadal differentiation
56 days - paramesonephric duct fusion (female)
100 days - primary follicles (ovary)
Textbooks
BGDB: Lecture - Gastrointestinal System | Practical - Gastrointestinal System | Lecture - Face and Ear | Practical - Face and Ear | Lecture - Endocrine | Lecture - Sexual Differentiation | Practical - Sexual Differentiation | Tutorial
Glossary Links
- Glossary: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Term Link
Cite this page: Hill, M.A. (2024, May 21) Embryology BGDB Practical - Sexual Differentiation. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/BGDB_Practical_-_Sexual_Differentiation
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G