mechanism of labour

mechanism of labour

An obstetrical term of art referring to the seven sequential movements that a foetus undergoes as it passes through birth canal:
• Engagement;
• Descent; 
• Flexion;
• Internal rotation;
• Extension; 
• Restitution and external rotation; and
• Expulsion.
References in periodicals archive ?
Jonathan Schaffir, associate professor of obstetrics and gynaecology at Ohio State University and lead author of the study, said that though the exact mechanism of labour initiation remains unknown, it appears that the process begins when the fetus produces certain hormones.