Mechanisms Of Labor (EDFIERRE)

The mechanisms of labor comprises of the following:

1. Engagement - presenting part of the fetus is fixed in true pelvis


2. Descent - presenting part progresses through pelvis; level os station


3. Flexion - descending head meets pelvic floor; chin is brought down to chest


4. Internal Rotation - fetal head rotates from transverse diameter to anteroposterior diameter to facilitate movement through pelvis


5. Extension - once fetal head reaches perineum, it extends to be born


6. Restitution - after delivery of the head, it rotates back to position prior to engagement


7. External Rotation - shoulder engage and move similarly to head


8. Expulsion - entire infant emerges from mother

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