Chapter 20 - Processes and Stages of Labor and Birth

bloody show

pink-tinged mucus secretions resulting from rupture of small capillaries as the cervix effaces and dilates

cardinal movements

the positional changes of the fetus as it moves through the birth canal during labor and birth; the positional changes are descent, flexion, internal rotation, extension, restitution, and external rotation; also called mechanisms of labor

cervical dilatation

process in which the cervical os and the cervical canal widen from less than 1 cm to approximately 10 cm, allowing birth of the fetus

crowning

appearance of the presenting fetal part at the vaginal orifice during labor

duration

the time length of each contraction, measured from the beginning of the increment to the completion of the decrement

effacement

thinning and shortening of the cervix that occurs late in pregnancy or during labor

engagement

the entrance of the fetal presenting part into the superior pelvic strait and the beginning of the descent through the pelvic canal

fetal attitude

relationship of the fetal parts to one another; normal fetal attitude is one of moderate flexion of the arms onto the chest and flexion of the legs onto the abdomen

fetal lie

relationship of the cephalocaudal axis (spinal column) of the woman; the fetus may be in a longitudinal or transverse lie

fetal position

relationship of the landmark on the presenting fetal part to the front, sides, or back of the maternal pelvic

fetal presentation

the fetal body part that enters the maternal pelvis first; the three possible presentations are cephalic, shoulder, and breech

fontanelle

in the fetus, an unossified space, or soft spot, consisting of a strong band of connective tissue lying between the cranial bones of the skull

frequency

the time between the beginning of one contraction and the beginning of the next contraction

intensity

the strength of a uterine contraction during acme

lightening

moving of the fetus and uterus downward into the pelvic cavity

malpresentation

a presentation of the fetus into the birth canal that is not "normal" - that is, brow, face, shoulder, or breech presentation

molding

shaping of the fetal head by overlapping of the cranial bones to facilitate movement through the birth canal during labor

presenting part

the fetal part present in or on the cervical os

rupture of membranes (ROM)

rupture may be PROM (premature), SROM (spontaneous), or AROM (artificial); some clinicians may use the abbreviation RBOW (rupture of bag of waters)

spontaneous rupture of membranes (SROM)

the breaking of the "water" or membranes marked by the expulsion of amniotic fluid from the vagina

station

relationship of the presenting fetal part to an imaginary line drawn between the pelvic ischial spines

sutures

fibrous connection of opposed joint surfaces, as in the skull

bloody show

pink-tinged mucus secretions resulting from rupture of small capillaries as the cervix effaces and dilates

cardinal movements

the positional changes of the fetus as it moves through the birth canal during labor and birth; the positional changes are descent, flexion, internal rotation, extension, restitution, and external rotation; also called mechanisms of labor

cervical dilatation

process in which the cervical os and the cervical canal widen from less than 1 cm to approximately 10 cm, allowing birth of the fetus

crowning

appearance of the presenting fetal part at the vaginal orifice during labor

duration

the time length of each contraction, measured from the beginning of the increment to the completion of the decrement

effacement

thinning and shortening of the cervix that occurs late in pregnancy or during labor

engagement

the entrance of the fetal presenting part into the superior pelvic strait and the beginning of the descent through the pelvic canal

fetal attitude

relationship of the fetal parts to one another; normal fetal attitude is one of moderate flexion of the arms onto the chest and flexion of the legs onto the abdomen

fetal lie

relationship of the cephalocaudal axis (spinal column) of the woman; the fetus may be in a longitudinal or transverse lie

fetal position

relationship of the landmark on the presenting fetal part to the front, sides, or back of the maternal pelvic

fetal presentation

the fetal body part that enters the maternal pelvis first; the three possible presentations are cephalic, shoulder, and breech

fontanelle

in the fetus, an unossified space, or soft spot, consisting of a strong band of connective tissue lying between the cranial bones of the skull

frequency

the time between the beginning of one contraction and the beginning of the next contraction

intensity

the strength of a uterine contraction during acme

lightening

moving of the fetus and uterus downward into the pelvic cavity

malpresentation

a presentation of the fetus into the birth canal that is not "normal" - that is, brow, face, shoulder, or breech presentation

molding

shaping of the fetal head by overlapping of the cranial bones to facilitate movement through the birth canal during labor

presenting part

the fetal part present in or on the cervical os

rupture of membranes (ROM)

rupture may be PROM (premature), SROM (spontaneous), or AROM (artificial); some clinicians may use the abbreviation RBOW (rupture of bag of waters)

spontaneous rupture of membranes (SROM)

the breaking of the "water" or membranes marked by the expulsion of amniotic fluid from the vagina

station

relationship of the presenting fetal part to an imaginary line drawn between the pelvic ischial spines

sutures

fibrous connection of opposed joint surfaces, as in the skull