Lesson 1 and 2 Flashcards
is a series of continuous, progressive contractions of the uterus which help the cervix to open (dilate) and to thin (efface), allowing the fetus to move through the birth canal.
Labor
movement of the uterus
Contraction
a series of passive, adoptive movements of the fetal head and shoulders smallest diameter to pass through the birth canal
Mechanism of Labor
are the positional movements that the fetus undergoes to accommodate itself to the maternal pelvis
Mechanism of Labor
Mechanism of Labor
Engagement
Descent
Flexion
Internal Rotation
Extension
External Rotation
Expulsion
the biparietal diameter of the head passes the pelvic inlet
Engagement
the head is fixed in the pelvis
Engagement
occurs when the largest diameter of the fetal head fits into the largest diameter of the maternal pelvis
Engagement
As the fetal head engages, the head moves towards the pelvic brim in either the left or right occipito-transverse position
Engagement
This allows the widest part of the fetal head to fit through the widest part of the pelvic foot
Engagement
the downward movement of the biparietal diameter of the fetal head within the pelvic inlet
Descent
progress of the presenting part through the pelvis
Descent
as Descent occurs, the head bends forward to the chest, making the smallest anteroposterior diameter (the suboccipitobregmatic diameter) present to the birth canal
Flexion
is aided by abdominal muscle contraction during pushing
Flexion
the head enters the pelvis with the fetal anteroposterior head diameter in a diagonal or transverse position
Internal Rotation
fetal skull rotates along the axis from transverse to anteroposterior at pelvic outlet
Internal Rotation
head passes the midpelvis
Internal Rotation