Chapter 06: Placenta and Fetal Membranes

Chapter 06: Placenta and Fetal Membranes

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

MULTIPLE CHOICE

Directions: Each group of questions below consists of a numbered list of descriptive words or phrases accompanied by a diagram with certain parts indicated by letters or by a list of lettered headings. For each numbered word or phrase, select the lettered part or heading that matches it correctly and then insert the letter in the space to the right of the appropriate number. Sometimes more than one numbered word or phrase may be correctly matched to the same lettered part or heading.

________ Decidua capsularis

ANS:   B

The decidua capsularis is the part of the decidua (gravid endometrium) that encapsulates the luminal surface of the implanted conceptus. At the stage shown, it is fused with the smooth chorion (chorion laeve). Together the amnion and chorion form the amniochorionic membrane.

________ Ensheaths umbilical cord

ANS:   D

As the amniotic sac enlarges, it obliterates the chorionic cavity and ensheaths the umbilical cord. The amnion becomes the epithelial covering of the cord.

________ Smooth chorion

ANS:   C

The smooth chorion is continuous with the chorionic plate (“roof”) of the placenta. From the third to eighth weeks, the chorionic sac is covered by villi. The villi degenerate as the amniotic sac enlarges and presses the chorion against the decidua capsularis. This reduces the blood supply to the villi and results in their degeneration.

________ Decidua parietalis

ANS:   A

The decidua parietalis refers to the endometrium lining parts of the uterus not directly involved with the conceptus (i.e., endometrium not designated as decidua capsularis or decidua basalis).