TY - CHAP M1 - Book, Section TI - Normal Labor A1 - Cunningham, F. Gary A1 - Leveno, Kenneth J. A1 - Bloom, Steven L. A1 - Dashe, Jodi S. A1 - Hoffman, Barbara L. A1 - Casey, Brian M. A1 - Spong, Catherine Y. Y1 - 2018 N1 - T2 - Williams Obstetrics, 25e AB - It follows that some process of adaptation or accommodation of suitable portions for the head to the various pelvic planes is necessary to insure the completion of childbirth. This is brought about by certain movement of the presenting part, which belong to what is termed the mechanism of labour.—J. Whitridge Williams (1903) SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - obgyn.mhmedical.com/content.aspx?aid=1160775159 ER -