BGDA Practical Placenta - Maternal Decidua: Difference between revisions

Revision as of 18:13, 29 May 2012

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Uterus

Uterus proliferative phase
Uterine gland proliferative phase
Uterus secretory phase
Uterine gland secretory phase

Endometrium - 3 layers in secretory phase of menstrual cycle: compact, spongy, basal
Myometrium - muscular layer outside endometrium, contracts in parturition
Perimetrium - tunica serosa of the uterus continuous with the peritoneal wall

Endometrial Layers

Compact - implantation occurs in this layer, dense stromal cells, uterine gland necks, capillaries of spiral arteries
Spongy - swollen stromal cells, uterine gland bodies, spiral arteries
Basal - not lost during menstruation or childbirth, own blood supply

Decidual Reaction

occurs initially at site of implantation and includes both cellular and matrix changes
reaction spreads throughout entire uterus, not at cervix
deposition of fibrinoid and glycogen and epithelial plaque formation (at anchoring villi)
presence of decidual cells are indicative of pregnancy

Cervix - at mouth of uterus, secretes mucus (CMP), forms a plug/barrier, mechanical and antibacterial Vascular - increased number of blood vessels

Decidua

The endometrium becomes the decidua and forms 3 distinct anatomical regions (at approx 3 weeks)

Decidua Basalis at implantation site
Decidua Capsularis enclosing the conceptus
Decidua Parietalis the remainder of uterus
- Decidua Capsularis and Parietalis fuse eventually fuse and uterine cavity is lost by 12 weeks

Uterine and Placental Vasculature in Non-pregnant, Pregnant and immediate Post-partum State

Diagrammatic representation of uterine and placental vasculature (red shading = arterial; blue shading = venous) in the non-pregnant, pregnant and immediate post-partum state.

Normal pregnancy is characterized by the formation of large arterio-venous shunts that persist in the immediate post-partum period.
Extravillous cytotrophoblast invasion in normal pregnancy (diamonds) extends beyond the decidua into the inner myometrium resulting in the formation of funnels at the discharging tips of the spiral arteries.
Pregnancies complicated by severe preeclampsia are characterized by minimal arterio-venous shunts, and thus narrower uterine arteries. Contrast with severe preeclampsia.

Terms

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Cite this page: Hill, M.A. (2024, May 18) Embryology BGDA Practical Placenta - Maternal Decidua. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/BGDA_Practical_Placenta_-_Maternal_Decidua

What Links Here?

@@ Line 38: / Line 38: @@
 ** Decidua  Capsularis and Parietalis fuse eventually fuse and uterine cavity is lost by 12 weeks
+{|
+| Uterine and Placental Vasculature  in Non-pregnant, Pregnant and immediate Post-partum State
+Diagrammatic representation of uterine and placental vasculature (red shading = arterial; blue shading = venous) in the non-pregnant, pregnant and immediate post-partum state.
-{{Template:Placenta Links}}
+* Normal pregnancy is characterized by the formation of large arterio-venous shunts that persist in the immediate post-partum period.
+* Extravillous cytotrophoblast invasion in normal pregnancy (diamonds) extends beyond the decidua into the inner myometrium resulting in the formation of funnels at the discharging tips of the spiral arteries.
+* Pregnancies complicated by severe preeclampsia are characterized by minimal arterio-venous shunts, and thus narrower uterine arteries. Contrast with severe preeclampsia.
+| [[File:Uterine_and_placental_vasculature.jpg]]
+|}
 ==Terms==