OBSadvanced
Explain how flexion and internal rotation contribute to progress in vertex labour.
Answer
Flexion permits a smaller fetal head diameter, the suboccipitobregmatic diameter, to pass through the pelvis. Internal rotation turns the occiput, commonly toward the symphysis pubis, to align the head with the maternal pelvis for subsequent extension and delivery.
Explanation
Flexion changes fetal head attitude so that a smaller diameter presents. Internal rotation then changes the direction of the occiput, commonly toward the anterior pelvis, helping the head align with the birth canal. These are complementary adaptations rather than interchangeable movements. **Key takeaway:** Flexion reduces the presenting diameter; internal rotation aligns the head.\n\n**Glossary:** **Attitude**: relationship of fetal parts to one another; **occiput**: back of the fetal head.
Related Questions
- Explain why correct placement at the vacuum flexion point matters and describe where that point is located.(advanced)
- The forceps specially designed to deliver the after-coming head in breech birth are _____ forceps.(basic)
- For forceps delivery, the fetal head should be engaged and the position of the vertex known with certainty.(basic)
- Which of the following is a mandatory prerequisite before proceeding with a forceps-assisted vaginal delivery?(intermediate)
- Arrange these principal stages of vacuum extraction in order.(intermediate)
Want to practice more questions like this?
Join myBenkio free and practice past questions for your Nigerian university courses with AI explanations for every answer.
Start Practicing Free