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Mechanism of normal labour

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It explains the mechanism of normal labour to medical and para-medical staff.It also puts light on principle movements underlying mechanism of normal labour with pictures.Thank You Like an share it to the maximum.

Mechanism of normal labour

  1. 1. MECHANISM OF LABOUR JASLEEN KAUR MSc.(N)
  2. 2. DEFINITION Series of events that takes place on genital organ in an effort to expel the viable product of conception out of the womb through vagina into the outer world.
  3. 3. PRINCIPLES There are three principles of mechanism of labour. a) Descent takes place throughout labour. b) Whichever part leads and first meets the pelvic floor will rotate forward until it comes under symphysis pubis. c) Whatever part emerges from the pelvis will pivot around pubic bone. Nemonics DSP (descent, symphysis pubis and pubic bone) to remember principles of mechanism of labour.
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  5. 5. CRITERIA FOR NORMAL MECHANISM OF LABOUR • Lie is longitudinal • Presentation cephalic • Position ROA or LOA • Attitude is good flexion • Denominator is occiput • Presenting part is posterior part of anterior parietal bone
  6. 6. PRINCIPLE MOVEMENTS IN NORMAL MECHANISM OF LABOUR • Engagement • Descent • Flexion • Internal rotation of head • Crowning • Extension of head • Restitution
  7. 7. PRINCIPLE MOVEMENTS IN NORMAL MECHANISM OF LABOUR • Internal rotation of shoulders • External rotation of head • Delivery of body by lateral flexion Nemonics to remember mechanism of labour END FLICER ICED (flicer means very bright ) so flicer company ke end hone se uska manaager iced ho gya.
  8. 8. PRINCIPLE MOVEMENTS IN NORMAL MECHANISM OF LABOUR • Engagement – Engages with sagittal sutures in right oblique and biparietal diameter in left oblique – Occiput points to left ileo pectineal eminence • Descent – Fetus descent due to contraction and retraction of uterine muscle • Flexion – Engaging diameter is sub occipito frontal (10cm) – Changes to sub occipito bragmatic (9.5cm)
  9. 9. Engagement
  10. 10. • Internal rotation of head – Occiput is the leading part – Rotates one by eighth of the circle – Sagittal suture comes in APD – Slight twist in the neck of the fetus • Crowning – Biparietal diameter stretches at vulval outlet • Extension of head – Releases Sinciput face and chin – Head is born by flexion • Restitution – Twist in the neck of the fetus is corrected by slight untwisting movement – Occiput turns one by eighth of the circle towards the maternal side
  11. 11. Crowning
  12. 12. • Internal rotation of shoulders –Shoulders rotate one by eighth of a circle to lie under symphysis pubis • External rotation of head –Occiput rotates further one by eighth to the mothers left side • Delivery of body by lateral flexion –Anterior shoulder escapes under symphysis pubis –Posterior shoulder sweeps the perineum –Body is born by lateral flexion
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It explains the mechanism of normal labour to medical and para-medical staff.It also puts light on principle movements underlying mechanism of normal labour with pictures.Thank You Like an share it to the maximum.

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