BGDB Sexual Differentiation - Fetal: Difference between revisions
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| '''Female Uterus and Vagina (between week 9 and 20)''' | | '''Female Uterus and Vagina (between week 9 and 20)''' | ||
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===Female External Genitalia=== | ===Female External Genitalia=== | ||
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[[External Genital Female Development Movie]] | [[External Genital Female Development Movie]] | ||
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===Male External Genitalia=== | ===Male External Genitalia=== | ||
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[[External Genital Male Development Movie]] | [[External Genital Male Development Movie]] | ||
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==Gonad Descent== | ==Gonad Descent== | ||
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[[Gonad Blood Supply Development]] | [[Gonad Blood Supply Development]] | ||
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==Historic Genital Images== | ==Historic Genital Images== | ||
Keith, A. (1902) [[Book - Human Embryology and Morphology|Human Embryology and Morphology]]. London: Edward Arnold. | |||
[[Book - Human Embryology and Morphology 9|Chapter 9 - The Uro-genital System]] | |||
<gallery> | |||
File:Keith1902 fig079.jpg|Fig. 79. Scheme of the Wolffian Body of the right side. | |||
File:Keith1902 fig080.jpg|Fig. 80. Position of the Wolffian and Genital Ridges on the dorsal wall of the abdomen. | |||
File:Keith1902 fig081.jpg|Fig. 81. Remnants of the Wolffian Body in the Female. | |||
File:Keith1902 fig082.jpg|Fig. 82. Remnant of the "Wolffian Body in the Male. | |||
File:Keith1902 fig083.jpg|Fig. 83. The Origin of the Renal Bud (diagrammatic). | |||
File:Keith1902 fig084.jpg|Fig. 84. The Termination of the Ureter in the Bladder and Sub-division of the Renal Bud | |||
File:Keith1902 fig085.jpg|Fig. 85. A transverse section to show Wolffian and Müllerian Ducts arise, and their position in the Wolffian Ridge. | |||
File:Keith1902 fig086.jpg|Fig. 86. Diagram of the Genital Ducts at -the commencement of the 3rd month of foetal life. Lateral view. | |||
File:Keith1902 fig087.jpg|Fig. 87. Diagram of the Müllerian Ducts at the commencement of the 3rd month. Ventral view. | |||
File:Keith1902 fig088.jpg|Fig. 88. Evolution of the Human Form of Uterua. | |||
File:Keith1902 fig089.jpg|Fig. 89. Showing the manner in which the Mulleriau Ducts fuse to form the Uterus and Vagina. | |||
File:Keith1902 fig090.jpg|Fig. 90. A section of the Prostate showing the Hemnants of the lower ends of the Mttllerian Ducts in the male. | |||
File:Keith1902 fig091.jpg|Fig. 91. A section of a Prostate showing an unusually developed Uterus Masculinus. (After Primrose.) | |||
File:Keith1902 fig092.jpg|Fig. 92. Section showing the Uro-genital Sinus. A. 4th month female human foetus. B. 5th month female human foetus. | |||
File:Keith1902 fig093.jpg|Fig. 93. Section showing the Uro-genital Sinus in the male foetus. | |||
File:Keith1902 fig094.jpg|Fig. 94. A section to show the condition of the Vagina and Uterus at the 7th month of foetal life. | |||
File:Keith1902 fig095.jpg|Fig. 95. The Division of the Cloaca into Rectal and Uro-genital Parts. | |||
File:Keith1902 fig096.jpg|Fig. 96. Imperforate Anus due to a persistence of the Anal Plate. | |||
File:Keith1902 fig097.jpg|Fig. 97. Rectal part of the Anal Plate has persisted and the Cloacal Septum has failed to fuse with the Perineal Septum. | |||
File:Keith1902 fig098.jpg|Fig. 98. The Uro-genital Cleft or Depression and the Genital Tubercle and Folds towards the end of the 2nd month. | |||
File:Keith1902 fig099.jpg|Fig. 99. A section of the male bladder and urethra at birth. | |||
File:Keith1902 fig100.jpg|Fig. 100. A A section to show the condition of parts in Ectopia Vesicae. | |||
File:Keith1902 fig101.jpg|Fig. 101. A diagram to show the position at which the Prostatic Tubules arise. | |||
File:Keith1902 fig102.jpg|Fig. 102. The Position of the Testis in a foetus of 2£ months . | |||
File:Keith1902 fig103.jpg|Fig. 103. Showing the Position of the Testis at the 6th month, and the Formation of the Gubernaculum Testis. | |||
File:Keith1902 fig104.jpg|Fig. 104. Structures in the wall of the abdomen are carried out so as to form the Inguinal Canal and Coverings of the Testis. | |||
File:Keith1902 fig105.jpg|Fig. 105. A diagram of the Processus Vaginalis. | |||
</gallery> | |||
<gallery> | <gallery> |
Revision as of 00:08, 2 June 2014
Practical 12: Sex Determination | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | 2011 Audio |
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.
Week 10 Female
|
Plane A (most lateral) | Plane B (lateral) |
Plane C (medial) | Plane D (midline) |
Uterus and Vagina
Mouse paramesonephric duct (Müllerian duct)[1] |
This mouse image shows the relationship between the mesonephric and paramesonephric ducts opening into the urogenital sinus.
|
<mediaplayer width='490' height='500' image="http://php.med.unsw.edu.au/embryology/images/2/2d/Uterus_001_icon.jpg">File:Uterus_001.mp4</mediaplayer> | Female Uterus and Vagina (between week 9 and 20)
The uterus and broad ligament will eventulaly divide the pelvic cavity into two separate pouches.
|
This graph shows the growth during the fetal period of the uterus between week 19 and 38.[2]
|
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
<mediaplayer width='270' height='380' image="http://php.med.unsw.edu.au/embryology/images/3/37/Male_external_001_icon.jpg">File:Female_external_001.mp4</mediaplayer> | Animation showing the development of external female genitalia from the indifferent external structure (week 9 to 12 approximately).
|
Male External Genitalia
<mediaplayer width='270' height='380' image="http://php.med.unsw.edu.au/embryology/images/3/37/Male_external_001_icon.jpg">File:Male_external_001.mp4</mediaplayer> | Animation showing the development of external male genitalia from the indifferent external structure (week 9 to 12 approximately).
|
External Genitalia Comparison
Gonad Descent
<mediaplayer width='296' height='430' image="http://php.med.unsw.edu.au/embryology/images/7/75/Gonad_blood_01_icon.jpg">File:Gonad blood 01.mp4</mediaplayer> | Animation shows the descent of the gonads and their blood supply.
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Internal Gonad Descent
Testes Descent
Start of testis descent | End of testis descent |
Additional Information
Additional Information - Content shown under this heading is not part of the material covered in this class. It is provided for those students who would like to know about some concepts or current research in topics related to the current class page. |
Testes Descent Timeline
Data from a study of male human fetal (between 10 and 35 weeks) gonad position.[3]
- 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[4]
- 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.[5]- Species comparison of descent timeline
Historic Genital Images
Keith, A. (1902) Human Embryology and Morphology. London: Edward Arnold.
Chapter 9 - The Uro-genital System
Practical 12: Sex Determination | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | 2011 Audio |
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
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Cite this page: Hill, M.A. (2024, March 19) Embryology BGDB Sexual Differentiation - Fetal. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/BGDB_Sexual_Differentiation_-_Fetal
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G