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Implantation
It is the process by which blastocyst is embedded in the endometrium.
Timing: Starts at 6th day and completed at 11th day.
Site: usually at upper part of posterior wall of uterus near fundus.
Dr. Sherif Fahmy
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Blastocyst Formation
Dr. Sherif Fahmy
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Steps of Implantation Blastocyst fixes its embryonic pole to site
of implantation. Syncytiotropholast erodes endometrium
till blastocyst reach spongy layer of endometrium.
Endometrium of pregnancy is called decidua.
Site of penetration is closed by fibrin clot at 9th day.
Surface epithelium overgrows the fibrin clot at 11th day Dr. Sherif Fahmy
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Dr. Sherif Fahmy
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Dr. Sherif Fahmy
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Dr. Sherif Fahmy
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Dr. Sherif Fahmy
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Abnormal Sites of Implantation
1- Ectopic pregnany: They are tubal, ovarian or abdominal.
2- Placenta praevia: lateralis, marginalis and centralis.
Dr. Sherif Fahmy
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Placenta Praevia
Dr. Sherif Fahmy
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Dr. Sherif Fahmy
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Decidua
It is endometrium after implantation. Character of endometrium:
Increased secretory function of uterine glands.
Decidual cells are stromal cells filled with glycogen.
Arteries become more spiral with arterio-venous anastomosis.
Dr. Sherif Fahmy
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Dr. Sherif Fahmy
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Dr. Sherif Fahmy
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Parts of decidua:
Decidua basalis: It is the part of decidua between blastocyst and myometrium.
Decidua capsularis: It covers the blastocyst and separates it from uterine cavity.
Decidua parietalis: It is the rest of endometrium.
Dr. Sherif Fahmy
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Fate of decidua:
Decidua basalis shares in the formation of placenta.
Decidua capsularis and parietalis fuse together and sheded with placenta after delivary.
Dr. Sherif Fahmy