ANAT2341 Lab 8 - Fetal: Difference between revisions
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In the previous section we observed late embryonic male genital development and now in fetal development we will observe early fetal female development. Then we will explore fetal development of the external genitalia and gonadal descent. | In the previous section we observed late embryonic male genital development and now in fetal development we will observe early fetal female development. Then we will explore fetal development of the external genitalia and gonadal descent. | ||
==Renal== | |||
The following events occur during the fetal period. Note that the nephron loop of henle continues to develop after birth. | |||
{| | |||
! Nephron development<ref name=PMID23338209><pubmed>23338209</pubmed></ref> | |||
|- | |||
| [[File:Nephron development 01.jpg|600px]] | |||
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* '''a''' - condensed aggregate forms | |||
* '''b''' - renal vesicle forms | |||
* '''c''' - S-shaped body (red), renal progenitors are localised, at this stage podocyte-committed progenitors (red + blue) as well as tubular-committed progenitors (orange) can already be seen. | |||
* '''d''' - mature nephron, renal progenitors (red), podocyte-committed progenitors (red + blue), as well as tubular-committed progenitors (orange) are distributed along the nephron. | |||
* '''e''' - glomerulus, renal progenitors (red) are localized at the urinary pole of the Bowman capsule. Podocyte-committed progenitors (red + blue) localize along the Bowman capsule. | |||
|} | |||
==Week 10 Female== | ==Week 10 Female== | ||
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==External Genitalia== | ==External Genitalia== | ||
[[File:Spaulding01.jpg|thumb|Genital Tubercle]] | |||
[[File:Testosterone_metabolism.jpg|thumb|Testosterone metabolism]] | [[File:Testosterone_metabolism.jpg|thumb|Testosterone metabolism]] | ||
This next section will look at the development of the external genitalia using a series of animations and online resources. | This next section will look at the development of the external genitalia using a series of animations and online resources. | ||
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===Female External Genitalia=== | ===Female External Genitalia=== | ||
{| | {| | ||
| [[File:Female_external_001 icon.jpg|200px|link= | | [[File:Female_external_001 icon.jpg|200px|link=External_Genital_Female_Development_Movie]] | ||
| | Linked animation showing the development of external female genitalia from the indifferent external structure (week 9 to 12 approximately). | | | Linked animation showing the development of external female genitalia from the indifferent external structure (week 9 to 12 approximately). | ||
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===Male External Genitalia=== | ===Male External Genitalia=== | ||
{| | {| | ||
| [[File:Male_external_001 icon.jpg|200px|link= | | [[File:Male_external_001 icon.jpg|200px|link=External_Genital_Male_Development_Movie]] | ||
| Linked animation showing the development of external male genitalia from the indifferent external structure (week 9 to 12 approximately). | | Linked animation showing the development of external male genitalia from the indifferent external structure (week 9 to 12 approximately). | ||
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==Testes Descent== | ==Testes Descent== | ||
{| | {| | ||
| | [[File:Testis_001 icon.jpg|200px|link= | | | [[File:Testis_001 icon.jpg|200px|link=Testis_Descent_Movie]] | ||
| The linked animation shows the descent of the testes (between week 7 to 38, birth). | | The linked animation shows the descent of the testes (between week 7 to 38, birth). | ||
Latest revision as of 15:52, 22 September 2016
ANAT2341 Lab 8: Introduction | Sex Determination | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | Online Assessment | Genital Quiz |
Introduction
In the previous section we observed late embryonic male genital development and now in fetal development we will observe early fetal female development. Then we will explore fetal development of the external genitalia and gonadal descent.
Renal
The following events occur during the fetal period. Note that the nephron loop of henle continues to develop after birth.
Nephron development[1] | |
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Week 10 Female
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Plane A (midline) | Plane B (medial) |
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Plane C (lateral) | Plane D (most lateral) |
Uterus and Vagina
![]() Mouse paramesonephric duct (Müllerian duct)[2] |
This mouse image shows the relationship between the mesonephric and paramesonephric ducts opening into the urogenital sinus.
|
![]() |
This graph shows the growth during the fetal period of the uterus between week 19 and 38.[3]
|
External Genitalia
This next section will look at the development of the external genitalia using a series of animations and online resources.
Female External Genitalia
Male External Genitalia
External Genitalia Comparison
Gonad Descent
Internal Gonad Descent
Testes Descent
![]() |
![]() |
Start of testis descent | End of testis descent |
Additional Information
Testes Descent Timeline
Data from a study of male human fetal (between 10 and 35 weeks) gonad position.[4]
- 10 to 23 weeks - (9.45%) had migrated from the abdomen and were situated in the inguinal canal
- 24 to 26 weeks - (57.9%) had migrated from the abdomen
- 27 to 29 weeks - (16.7%) had not descended to the scrotum
A second study looked at the position of the testes[5]
- 33 weeks fetal testes had descended to the scrotum
- between 33 to 40 weeks (term) both testes have normally descended to the scrotum
Failure of descent (cryptorchidism) either unilateral or bilateral testicular descent, occurring in up to 30% premature and 3-4% term males.
Cryptorchidism in common eutherian mammals.[6]- Species comparison of descent timeline
Historic Genital Images
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, June 15) Embryology ANAT2341 Lab 8 - Fetal. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/ANAT2341_Lab_8_-_Fetal
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G