ANAT2341 Lab 8 - Late Embryo: Difference between revisions
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==Week 8== | ==Week 8== | ||
{| | {| | ||
| | | width=500px|<html5media height="500" width="505">File:Stage22_URG3d.mp4</html5media> | ||
(Carnegie stage 22, male) | [[Media:Stage22_URG3d.mp4|'''Click Here''' to play on mobile device]] | ||
(Carnegie stage 22, male) | |||
| valign="top" | '''Begin by observing the internal structure of the embryo at the end of week 8.''' | | valign="top" | '''Begin by observing the internal structure of the embryo at the end of week 8.''' | ||
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===Development of the Kidney=== | ===Development of the Kidney=== | ||
{| | {| | ||
| | | width=320px|<html5media height="460" width="300">File:Renal blood 01.mp4</html5media> | ||
[[Media:Renal blood 01.mp4|'''Click Here''' to play on mobile device]] | |||
| | | | ||
* starts in week 5 and is completed by week 15. | * starts in week 5 and is completed by week 15. | ||
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===Development of the Urinary Bladder=== | ===Development of the Urinary Bladder=== | ||
{| | {| | ||
| | | width=440px|<html5media height="440" width="420">File:Urogenital_septum_001.mp4</html5media> | ||
[[Media:Urogenital_septum_001.mp4|'''Click Here''' to play on mobile device]] | |||
| '''Division of the Cloaca''' | | '''Division of the Cloaca''' | ||
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==Trigone== | ==Trigone== | ||
{| | {| | ||
| [[ | | width=460px|<html5media height="380" width="450">File:Trigone_001.mp4</html5media> | ||
[[Media:Trigone_001.mp4|'''Click Here''' to play on mobile device]] | |||
| This animation shows the posterior of the developing bladder between Week 4 and 6. | | This animation shows the posterior of the developing bladder between Week 4 and 6. | ||
* The mesonephric duct (purple) has lateral branches forming the uteric bud (kidney) | * The mesonephric duct (purple) has lateral branches forming the uteric bud (kidney) |
Latest revision as of 11:58, 24 September 2014
ANAT2341 Lab 8: Introduction | Sex Determination | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | Online Assessment | Genital Quiz |
Week 8
<html5media height="500" width="505">File:Stage22_URG3d.mp4</html5media>
Click Here to play on mobile device (Carnegie stage 22, male) |
Begin by observing the internal structure of the embryo at the end of week 8.
|
Embryo (week 8, Stage 22) Renal
Urinary System Development
- The adult kidneys (the metanephroi) form from day 35, from a portion of the intermediate mesoderm called the metanephric blastema (or metanephric mesenchyme).
- They are induced to form by the ureteric buds, outgrowths from the end of the mesonephric ducts, which come into contact with the metanephric blastema.
- Upon contact, they begin to lengthen and bifurcate rapidly in the metanephric blastema – these branches differentiate into the collecting ducts.
- Both the ureteric buds and the metanephric blastema begin to differentiate; interestingly each induces differentiation in the other structure.
- The ureteric bud is induced by the metanephric blastema to form the collecting tubules, renal pelvis and ureters.
- The metanephric blastema is induced to form the nephrons.
Development of the Kidney
<html5media height="460" width="300">File:Renal blood 01.mp4</html5media> |
|
Development of the Urinary Bladder
<html5media height="440" width="420">File:Urogenital_septum_001.mp4</html5media> | Division of the Cloaca
|
Development of the Urethra
- Further development of the urinary system 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.
Genital System Development
Male
G3 testis | G4 rete tesits |
- 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 ducts go on to form the internal genital tract:
- uterine (fallopian) tubes
- uterus body
- vagina
In both sexes, the external genitalia appear similar until the 12th week.
Trigone
<html5media height="380" width="450">File:Trigone_001.mp4</html5media> | This animation shows the posterior of the developing bladder between Week 4 and 6.
|
G5 urogenital | G6 urogenital | G7 urogenital |
Additional Information
Renal Links: renal | Lecture - Renal | Lecture Movie | urinary bladder | Stage 13 | Stage 22 | Fetal | Renal Movies | Stage 22 Movie | renal histology | renal abnormalities | Molecular | Category:Renal | ||
|
References
ANAT2341 Lab 8: Introduction | Sex Determination | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | Online Assessment | Genital Quiz |
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, March 29) Embryology ANAT2341 Lab 8 - Late Embryo. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/ANAT2341_Lab_8_-_Late_Embryo
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G