Difference between revisions of "Placenta"

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Image:

*[http://www.glowm.com/resources/glowm/graphics/figures/v2/1070/05b.jpg SUA (glown.com)].<ref>URL: [http://www.glowm.com/?p=glowm.cml/section_view&articleid=151 http://www.glowm.com/?p=glowm.cml/section_view&articleid=151]. Accessed on: 8 January 2011.</ref>

==Insertion==

===Marginal insertion===

Definition:

*The umbilical cord is attached to the placental disc at its margin.

Prevalence:

*Approximately 12% of placentas.<ref name=Ref_WMSP464>{{Ref WMSP|464}}</ref>

Relevance:

*None according to WMSP.<ref name=Ref_WMSP464>{{Ref WMSP|464}}</ref>

**In theory, the cord, dependent on its relation to the internal os, is at greater risk of injury (leading to vasa previa) and compression (fetal hypoxia). A retrospective study found cord position in relation to the internal os is predictive for vasa previa.<ref name=pmid20872421>{{cite journal |author=Hasegawa J, Farina A, Nakamura M, ''et al.'' |title=Analysis of the ultrasonographic findings predictive of vasa previa |journal=Prenat. Diagn. |volume=30 |issue=12-13 |pages=1121–5 |year=2010 |month=December |pmid=20872421 |doi=10.1002/pd.2618 |url=}}</ref>

===Velamentous insertion==

Definition:

*The umbilical cord inserts into the fetal membranes.<ref name=Ref_WMSP464>{{Ref WMSP|464}}</ref>

**The vessels are ''not'' protected by Wharton's jelly.

***Wharton's jelly = the connective tissue surrounding the vessels in the cord.

Details:<ref name=Ref_WMSP464>{{Ref WMSP|464}}</ref>

*3/4 of the time the vessel also branch; in the remaining 1/4 the vessels stay together.

Relevance:

*Increased risk of vasa previa.<ref name=pmid20872421>{{cite journal |author=Hasegawa J, Farina A, Nakamura M, ''et al.'' |title=Analysis of the ultrasonographic findings predictive of vasa previa |journal=Prenat. Diagn. |volume=30 |issue=12-13 |pages=1121–5 |year=2010 |month=December |pmid=20872421 |doi=10.1002/pd.2618 |url=}}</ref>

=Twin placentas=

Difference between revisions of "Placenta"

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@@ Line 212: / Line 212: @@
 Image:
 *[http://www.glowm.com/resources/glowm/graphics/figures/v2/1070/05b.jpg SUA (glown.com)].<ref>URL: [http://www.glowm.com/?p=glowm.cml/section_view&articleid=151 http://www.glowm.com/?p=glowm.cml/section_view&articleid=151]. Accessed on: 8 January 2011.</ref>
+==Insertion==
+===Marginal insertion===
+Definition:
+*The umbilical cord is attached to the placental disc at its margin.
+Prevalence:
+*Approximately 12% of placentas.<ref name=Ref_WMSP464>{{Ref WMSP|464}}</ref>
+Relevance:
+*None according to WMSP.<ref name=Ref_WMSP464>{{Ref WMSP|464}}</ref>
+**In theory, the cord, dependent on its relation to the internal os, is at greater risk of injury (leading to vasa previa) and compression (fetal hypoxia).  A retrospective study found cord position in relation to the internal os is predictive for vasa previa.<ref name=pmid20872421>{{cite journal |author=Hasegawa J, Farina A, Nakamura M, ''et al.'' |title=Analysis of the ultrasonographic findings predictive of vasa previa |journal=Prenat. Diagn. |volume=30 |issue=12-13 |pages=1121–5 |year=2010 |month=December |pmid=20872421 |doi=10.1002/pd.2618 |url=}}</ref>
+===Velamentous insertion==
+Definition:
+*The umbilical cord inserts into the fetal membranes.<ref name=Ref_WMSP464>{{Ref WMSP|464}}</ref>
+**The vessels are ''not'' protected by Wharton's jelly.
+***Wharton's jelly = the connective tissue surrounding the vessels in the cord.
+Details:<ref name=Ref_WMSP464>{{Ref WMSP|464}}</ref>
+*3/4 of the time the vessel also branch; in the remaining 1/4 the vessels stay together.
+Relevance:
+*Increased risk of vasa previa.<ref name=pmid20872421>{{cite journal |author=Hasegawa J, Farina A, Nakamura M, ''et al.'' |title=Analysis of the ultrasonographic findings predictive of vasa previa |journal=Prenat. Diagn. |volume=30 |issue=12-13 |pages=1121–5 |year=2010 |month=December |pmid=20872421 |doi=10.1002/pd.2618 |url=}}</ref>
 =Twin placentas=