RT Book, Section A1 Dy, Jessica A2 Posner, Glenn D. A2 Dy, Jessica A2 Black, Amanda A2 Jones, Griffith D. SR Print(0) ID 1106375841 T1 Normal Mechanisms of Labor T2 Oxorn-Foote Human Labor & Birth, 6e YR 2015 FD 2015 PB McGraw-Hill Medical PP New York, NY SN 9780071740289 LK obgyn.mhmedical.com/content.aspx?aid=1106375841 RD 2024/04/18 AB LOA is a common longitudinal cephalic presentation (Fig. 10-1). Two-thirds of occiput anterior positions are in the LOA position. The attitude is flexion, the presenting part is the posterior part of the vertex and the posterior fontanelle, and the denominator is the occiput (O).