NVS Staff Nurse - 2022
Obstetrics & Gynaecology
Easy
Which one of the following is called the endometrium of the pregnant uterus?
Appeared in: NVS Staff Nurse - 2022
Explanation
- The endometrium of a pregnant uterus is specifically termed the decidua.
- This transformation, called decidualization, involves endometrial stromal cells becoming specialized secretory cells.
- The decidua is essential for the implantation of the blastocyst, provides nourishment, and helps form the maternal part of the placenta.
- It is named 'decidua' (from Latin 'deciduus', meaning to fall off) because it is shed after the delivery of the fetus.
Why Other Options Were Wrong
- Option B: The amnion is a fetal membrane, not a maternal uterine lining. It is the innermost membrane that encloses the embryo and the amniotic fluid.
- Option C: The chorion is the outermost fetal membrane. It surrounds the amnion and the embryo and contributes to the fetal part of the placenta.
- Option D: The morula is a very early stage of embryonic development, specifically a solid ball of 16-32 cells (blastomeres) formed from the zygote. It is a developmental stage, not a part of the uterine structure.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy and Physiology of the Pregnant Uterus as background academic context rather than a clinical decision trigger.
- Understanding the decidua is crucial for nurses as abnormalities in its development can lead to pregnancy complications like placenta accreta, where the placenta attaches too deeply into the uterine wall.
- After delivery, incomplete shedding of the decidua can lead to postpartum hemorrhage or infection, requiring careful assessment and management by the nursing staff.
- What if? - If decidualization is incomplete or defective, the embryo may fail to implant properly, leading to early pregnancy loss. This highlights the decidua's critical role in establishing a viable pregnancy.
How to Approach the Question
- Identify the key terms in the question: 'endometrium' and 'pregnant uterus'.
- Recognize that the question is asking for the specific name given to the uterine lining during pregnancy.
- Recall the anatomical and physiological changes that occur in the uterus after conception.
- Evaluate each option: 'Amnion' and 'Chorion' are fetal membranes. 'Morula' is an early embryonic stage.
- Conclude that 'Decidua' is the correct term for the specialized endometrium of pregnancy.
Concept Tested & Keywords
- Concept Tested: Anatomy and Physiology of the Pregnant Uterus
- Stem keywords: endometrium, pregnant uterus
- Lead-in keywords: Which one
- Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.
- Negative lead-in flag: false
Question ID
Qjr4YJ2HCMW7O4vClha0IA
Reference Book
E6 Obstetrics Williams p. 61-84
E6 Anatomy Grays 43e Vol 1 Part 2 p. 2-4
Practise the full NVS Staff Nurse - 2022
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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