EVENT’S LABOUR

 (1) Event in first stage of labour:-

(i) Fundal dominance in uterine contraction:-

Contraction stasts fundus

Pass across & down ward

Help in cervical dilation

(ii) Progressive Uterine contraction & Retraction:-

The Longitudinal muscle fiber of the upper uterine segment attach with circular muscle fiber of the lower segment.

With each uterine contraction, not only the canal is opened up from above down but it become shortened & retracted.

These are co-ordination b/w fundal contraction and cervical dilation

Upper segments contract the cervix dilate & pushes the fetus to the lower segment

Upper uterine segment is active

Lower uterine segment are passive

(iii) Cervical Effacement:-

Infusion of cervical canal in to lower uterine segment

Muscle fibers surrounding internal as draws upwards & merges in to lower uterine segment.

In primigravida effacement occur primarily & than dilator 

In multi both occur simultaneously  

(iv) Cervical Dilation:- 

It is process of enlargement of the as to an opening large enough to permit passage of fetal head.

Dilatation occurs due to uterine contraction & Retraction & pressure applied by presenting part & bags of water.

(v) Formation of bags of water (membranes):-

The membranes are attached loosely to the presentation the girdle of contact of the head.

Due to shortening of lower uterine segment membrane get detached increase intra uterine pressure.

Due to this membranes bulges down word forming bag of membrane.

When presenting part is engaged amniotic fluid is divided in to two parts

Former is form water

Later in hind water

Due to stretching of lower uterine pressure causes the membrane to bulge downward bag of membrane or water.

(vi)  Fetal Excess pressure:-

Contractions are transmitted to upper pole of fetus & then down the long axis of fetus & apply by presenting part of cervix

Help in cervical dilation

(2) Event’s of second stage of labour:-

This stage concerned with the

  (i) Continuous descend of the fetus

(ii) Delivery of the fetus-

Two fetus work in this stage

Expulsive force of uterine contraction

Bearing down effort (Voluntary contraction of abdominal muscle)

Lady holds her birth

Starts with full dilation of cervix

(3) Events of third stage of labour:-

(1) Placental Separation:-

The birth of the baby there is marked retraction which recduces the surface area of placental site effectively.

But placenta is inelastic so it can’t keep race with such as extent of diminution resulting in its buckling. 

Two ways of separation of placenta are- 

Central (Sedulity machine)

Marginal (Deccan Mech.)

(2) Expulsion of placenta:-

After complete separation it is forced down ward in to upper part of vagina by contraction & retraction of uterus.

Then expelled out by bearing down efforts.