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MECHANISM
 Lie is longitudinal
 Attitude complete flexion
 Engaging diameter Bitrochanteric 10cm
 Deniminator is sacrum
 Position RSA-LSA,RSP- LSP,RSL- LSL
 Presentation Breech
 Presenting part is left buttock
 Frank Breech
 Complete Breech
 Footling Presentation
 Knee Presentation
 The bitrochanteric diameter 10cm ,enters the
pelvis in the left oblique diameter of the brim
 The sacrum points to the left iliopectineal
eminence
 Engagement of the hips takes place in an LSA
position and the bitrochanteric diameter in
the left oblique diameter
 Descent takes place initially with increasing
compaction ,owing to increased flexion of the
limbs .Desent occurs through out
 The anterior buttocks reaches the pelvic floor
first and rotate forward 1/8th of a circle along
the right side of the pelvis to lie under the
symphysis pubis
 The bi trochanter diameter is now in the Ap
diameter of the outlet
 The anterior buttocks escapes under the
symphysis pubis ,the posterior buttocks
sweeps over the perineum and the buttocks
are born by a movement of lateral flexion
 The anterior buttocks turns slightly to the
mothers right side
 The shoulder(Bi sacromial Diameter 12cm)
enter the pelvis in the same left oblique
diameter .the Anterior shoulder rotate 1/8th
along the right side pelvis and escapes under
the symphysis pubis
 Birth of the shoulder takes place by lateral
flexion
 The anterior shoulder impinges beneath the
symphysis pubis and posterior shoulder
pivote around the pubic bone
 The head enter the pelvis with the saggital
suture in the transverse diameter of the brim
 The engaging diameter of the head is
suboccipito frontal 10cm
 The occiput rotate forward along the left side
of the pelvis and the subocciputal region
impinges under the symphysis pubis
 External rotation of the body takes place
simultaneously .the body turns so that the
back of the baby is upward and the baby
facing down
 The chin ,face and sinciput sweeps over the
perineum and the head is born in a flexed
attitude .

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Mechanism of Breech.pptx

  • 2.  Lie is longitudinal  Attitude complete flexion  Engaging diameter Bitrochanteric 10cm  Deniminator is sacrum  Position RSA-LSA,RSP- LSP,RSL- LSL  Presentation Breech  Presenting part is left buttock
  • 3.  Frank Breech  Complete Breech  Footling Presentation  Knee Presentation
  • 4.  The bitrochanteric diameter 10cm ,enters the pelvis in the left oblique diameter of the brim  The sacrum points to the left iliopectineal eminence
  • 5.  Engagement of the hips takes place in an LSA position and the bitrochanteric diameter in the left oblique diameter
  • 6.  Descent takes place initially with increasing compaction ,owing to increased flexion of the limbs .Desent occurs through out
  • 7.  The anterior buttocks reaches the pelvic floor first and rotate forward 1/8th of a circle along the right side of the pelvis to lie under the symphysis pubis  The bi trochanter diameter is now in the Ap diameter of the outlet
  • 8.  The anterior buttocks escapes under the symphysis pubis ,the posterior buttocks sweeps over the perineum and the buttocks are born by a movement of lateral flexion
  • 9.  The anterior buttocks turns slightly to the mothers right side
  • 10.  The shoulder(Bi sacromial Diameter 12cm) enter the pelvis in the same left oblique diameter .the Anterior shoulder rotate 1/8th along the right side pelvis and escapes under the symphysis pubis
  • 11.  Birth of the shoulder takes place by lateral flexion  The anterior shoulder impinges beneath the symphysis pubis and posterior shoulder pivote around the pubic bone
  • 12.  The head enter the pelvis with the saggital suture in the transverse diameter of the brim  The engaging diameter of the head is suboccipito frontal 10cm  The occiput rotate forward along the left side of the pelvis and the subocciputal region impinges under the symphysis pubis
  • 13.  External rotation of the body takes place simultaneously .the body turns so that the back of the baby is upward and the baby facing down
  • 14.  The chin ,face and sinciput sweeps over the perineum and the head is born in a flexed attitude .