Which decidual layer covers the surface of the implanted conceptus?

Which decidual layer covers the surface of the implanted conceptus?

• A. Decidua Basalis
• B. Decidua Capsularis
• C. Decidua Parietalis
• D. Empty Amnion Sign

Answer: (B)

The surface of the implanted conceptus is covered by the decidua capsularis, the portion of the endometrium that envelops the embryo on the side facing the uterine cavity. This decidual layer forms a capsule around the conceptus as implantation occurs, providing a maternal tissue cover. As pregnancy progresses, the capsularis expands and eventually fuses with the decidua parietalis, leading to the obliteration of the uterine cavity between them. The decidua basalis lies directly beneath the conceptus and contributes to the maternal portion of the placenta, while the decidua parietalis lines the rest of the uterine cavity. The term empty amnion sign is not a decidual layer and does not describe the covering of the conceptus.

The surface of the implanted conceptus is covered by the decidua capsularis, the portion of the endometrium that envelops the embryo on the side facing the uterine cavity. This decidual layer forms a capsule around the conceptus as implantation occurs, providing a maternal tissue cover. As pregnancy progresses, the capsularis expands and eventually fuses with the decidua parietalis, leading to the obliteration of the uterine cavity between them. The decidua basalis lies directly beneath the conceptus and contributes to the maternal portion of the placenta, while the decidua parietalis lines the rest of the uterine cavity. The term empty amnion sign is not a decidual layer and does not describe the covering of the conceptus.