1. Decidua
• It is endometrium after implantation
which is sheded after birth of fetus.
• Character of endometrium:
• Increased secretory function of uterine
glands.
• Decidual cells are endometrial cells filled with
glycogen.
• Arteries become more spiral with arterio-
venous anastomosis.
Dr. Sherif Fahmy
2. Parts of decidua:
• Decidua basalis: It is the part of decidua
between blastocyst and myometrium. It
forms the fetal part of placenta.
• Decidua capsularis: It covers the blastocyst
except embryonic pole and separates it from
uterine cavity.
• Decidua parietalis: It is the rest of
endometrium that lines the rest of uterine
cavity.
Dr. Sherif Fahmy
4. Fate of decidua:
• Decidua basalis shares in the
formation of placenta.
• Decidua capsularis and parietalis
fuse together and shedded with
placenta after delivery.
Dr. Sherif Fahmy
5. Dr. Sherif Fahmy
Decidua basalis
Decidua
parietalis
Decidua
capsularis
Uterine
cavity
Fused decidua
parietalis and
capsularis
Decidua
basalis
Dr. Sherif Fahmy