in 40 cases , intrauterine pressure ( iup ) which acts on the fetal body in the uterine cavity and pressure between the presenting part of the fetus and birth canal ( pfb ) which acts on the part of the fetus engaged in the birth canal were measured to determine the difference in pressure depending on the parts of the fetal body and their changes during the progress of labor .
C0015965
fetal
C0227844
uterine cavity