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==Placenta Anchoring Villi== | ==Placenta Anchoring Villi== | ||
Histological image showing the junctional region between the | Histological image showing the junctional region between the maternal decidua (left) and the embryonic placental villi (right). {{HE}} | ||
In week 2, the trophoblast shell cells proliferate and form a syncitiotrophoblast and cytotrophoblast layer around he conceptus. Syncitiotrophoblast cells migrate into the uterine wall, forming maternal blood-filled spaces (lacunae). | * In week 2, the trophoblast shell cells proliferate and form a syncitiotrophoblast and cytotrophoblast layer around he conceptus. | ||
* Syncitiotrophoblast cells migrate into the uterine wall, forming maternal blood-filled spaces (lacunae). | |||
Placentation begins once the conceptus begins to implant in the uterine wall and the placenta will have both a fetal and a maternal component. The fetal component begins as villi form. The fetal chorion will form two regions: smooth chorion (chorion laeve) and villous chorion (chorion frondosum). | Placentation begins once the conceptus begins to implant in the uterine wall and the placenta will have both a fetal and a maternal component. The fetal component begins as villi form. The fetal chorion will form two regions: smooth chorion (chorion laeve) and villous chorion (chorion frondosum). | ||
===Maternal Decidua=== | |||
The maternal component is formed by the decidualization of the endometrium. | The maternal component is formed by the decidualization of the endometrium. | ||
* '''Decidualization''' - (decidualisation) is the process by which uterine stromal cells differentiate in response to both steroid hormones (progesterone) and embryonic signals into large epitheliod decidual cells. This process is essential for the progress of implantation and establishing fetal-maternal communication. | |||
** Decidual cells form from the uterine stromal cells (fibroblast-like) that differentiate in response to hormonal and embryonic signals and then alter uterine environment to support further embryonic development as well as producing cytokines related to prolactin (PRL) and have an innate immune function. | |||
* '''Fibrinoid layer''' (Nitabuch's layer) is formed at maternal/fetal interface during placentation and is thought to act to prevent excessively deep conceptus implantation. | |||
** Fibrin-type fibrinoid - maternal blood-clot product) | |||
** Matrix-type fibrinoid - secreted by invasive extravillous trophoblast cells | |||
:{{Placenta Links}} | [[Implantation]] | |||
===Reference=== | |||
Image Source: UNSW Embryology, no reproduction without permission. | Image Source: UNSW Embryology, no reproduction without permission. | ||
{{Footer}} | |||
[[Category:Placenta]] [[Category:Histology]] | [[Category:Placenta]] [[Category:Histology]] [[Category:Trophoblast]] |
Latest revision as of 09:32, 8 August 2016
Placenta Anchoring Villi
Histological image showing the junctional region between the maternal decidua (left) and the embryonic placental villi (right). (Stain - Haematoxylin Eosin)
- In week 2, the trophoblast shell cells proliferate and form a syncitiotrophoblast and cytotrophoblast layer around he conceptus.
- Syncitiotrophoblast cells migrate into the uterine wall, forming maternal blood-filled spaces (lacunae).
Placentation begins once the conceptus begins to implant in the uterine wall and the placenta will have both a fetal and a maternal component. The fetal component begins as villi form. The fetal chorion will form two regions: smooth chorion (chorion laeve) and villous chorion (chorion frondosum).
Maternal Decidua
The maternal component is formed by the decidualization of the endometrium.
- Decidualization - (decidualisation) is the process by which uterine stromal cells differentiate in response to both steroid hormones (progesterone) and embryonic signals into large epitheliod decidual cells. This process is essential for the progress of implantation and establishing fetal-maternal communication.
- Decidual cells form from the uterine stromal cells (fibroblast-like) that differentiate in response to hormonal and embryonic signals and then alter uterine environment to support further embryonic development as well as producing cytokines related to prolactin (PRL) and have an innate immune function.
- Fibrinoid layer (Nitabuch's layer) is formed at maternal/fetal interface during placentation and is thought to act to prevent excessively deep conceptus implantation.
- Fibrin-type fibrinoid - maternal blood-clot product)
- Matrix-type fibrinoid - secreted by invasive extravillous trophoblast cells
Reference
Image Source: UNSW Embryology, no reproduction without permission.
Cite this page: Hill, M.A. (2024, April 19) Embryology Placenta anchoring villi.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Placenta_anchoring_villi.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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File usage
The following 31 pages use this file:
- 2009 Lecture 4
- 2009 Lecture 8
- 2010 BGD Lecture - Development of the Embryo/Fetus 1
- 2010 Lab 4
- 2010 Lecture 4
- 2010 Lecture 8
- 2011 Lab 4
- A
- ACPS Seminar 2014 - Implantation
- ANAT2341 Lab 4 - Decidua and Cord
- ANAT2341 Lab 4 - Implantation and Villi Development
- ASA Meeting 2013 - Placenta
- BGDA Lecture - Development of the Embryo/Fetus 1
- BGDA Practical Placenta - Maternal Decidua
- BGDA Practical Placenta - Villi Development
- D
- F
- Implantation
- Lecture - Placenta Development
- Lecture - Week 1 and 2 Development
- Lecture - Week 3 Development
- Placenta - Histology
- Placenta - Maternal Decidua
- Placenta - Membranes
- Placenta Development
- Trophoblast - Protein Expression
- Week 2
- Yolk Sac Development
- Talk:ANAT2341 Lab 4 - Implantation and Villi Development
- Talk:Lecture - Week 3 Development
- User:Z5014754