BGDB Sexual Differentiation - Late Embryo: Difference between revisions
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===Female=== | ===Female=== | ||
[[File:Urogenital female.jpg|thumb|Female]] | |||
* during the same time course as above, the opposite occurs. | * during the same time course as above, the opposite occurs. | ||
* The sex cords degenerate and the genital ridge forms secondary cortical sex cords. | * The sex cords degenerate and the genital ridge forms secondary cortical sex cords. | ||
* These induce the primordial germ cells to form the ovarian follicles. | * These induce the primordial germ cells to form the ovarian follicles. | ||
* Due to the lack of AMH and testosterone, the mesonephric ducts degenerate | * Due to the lack of AMH and testosterone, the mesonephric ducts degenerate | ||
* | '''Paramesonephric (Müllerian) ducts''' form the internal female genital tract | ||
* [[Uterus Development|Uterus]] - uterine (fallopian) tubes, uterus body | |||
* | * [[Vagina Development|Vagina]] | ||
In both sexes, the external genitalia appear similar until week 12 ({{GA}} week 14). | In both sexes, the external genitalia appear similar until week 12 ({{GA}} week 14). |
Revision as of 10:46, 4 June 2013
Practical 12: Sex Determination | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | 2011 Audio |
Week 8
<mediaplayer width='503' height='480' image="http://embryology.med.unsw.edu.au/embryology/images/2/26/Stage22_URG3d.jpg">File:Stage22_URG3d.mp4</mediaplayer>
Week 8, Carnegie stage 22, male. Page |
Begin by observing the internal structure of the embryo at the end of week 8.
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Embryo (week 8, Stage 22) Renal
Urinary System Development
Development of the Urinary Bladder
<mediaplayer width='360' height='500' image="http://embryology.med.unsw.edu.au/embryology/images/f/fe/Urogenital_sinus_001_icon.jpg">File:Urogenital_sinus_001.mp4</mediaplayer> | <mediaplayer width='420' height='415' image="http://embryology.med.unsw.edu.au/embryology/images/8/88/Urogenital_septum_001_icon.jpg">File:Urogenital_septum_001.mp4</mediaplayer> | Division of the Cloaca
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Development of the Urethra
Further development of the urinary system outflow tract, the urethra, varies depending on the sex of the embryo.
- Males - the pelvic urethra forms the membranous urethra, the prostatic urethra and penile urethra. (The sex of the above animation and sections is male)
- Females - the pelvic urethra forms the membranous urethra and the vestibule of the vagina.
Development of the Kidney
<mediaplayer width='400' height='280' image="http://embryology.med.unsw.edu.au/embryology/images/5/59/Renal_001_icon.jpg">File:Nephron_development.mp4</mediaplayer> |
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<mediaplayer width='295' height='430' image="http://embryology.med.unsw.edu.au/embryology/images/7/71/Renal_blood_01_icon.jpg">File:Renal blood 01.mp4</mediaplayer> |
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Genital System Development
Male
peritoneal cavity | rete tesits | G3 testis |
- week 8 - males Sertoli cells secrete anti müllerian hormone (AMH), which causes regression of the paramesonephric ducts between the 8th and 10th weeks.
- week 9 to 10 - gonadal cells begin to produce testosterone, which maintains the mesonephric ducts.
- mesonephric ducts go on to form the internal genital tract:
- rete testis
- ductuli efferentes
- vas deferens
Female
- during the same time course as above, the opposite occurs.
- The sex cords degenerate and the genital ridge forms secondary cortical sex cords.
- These induce the primordial germ cells to form the ovarian follicles.
- Due to the lack of AMH and testosterone, the mesonephric ducts degenerate
Paramesonephric (Müllerian) ducts form the internal female genital tract
In both sexes, the external genitalia appear similar until week 12 (GA week 14).
Trigone
<mediaplayer width='445' height='365' image="http://embryology.med.unsw.edu.au/embryology/images/5/5b/Trigone_001_icon.jpg">File:Trigone_001.mp4</mediaplayer> | This animation shows the posterior of the developing bladder between Week 4 and 6.
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G5 urogenital | urogenital |
Practical 12: Sex Determination | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | 2011 Audio |
Additional Information
References
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, April 26) Embryology BGDB Sexual Differentiation - Late Embryo. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/BGDB_Sexual_Differentiation_-_Late_Embryo
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G