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  Indian J Med Microbiol
 

Figure 1: Ultrasound image and diagram from the study material demonstrating (a) the AOP of the fetal head, (b) the HD angle of the fetal head, and (c) the HPD of the fetal head. AOP, angel of progression; HD, head direction; HPD, head progression distance.

Figure 1: Ultrasound image and diagram from the study material demonstrating (a) the AOP of the fetal head, (b) the HD angle of the fetal head, and (c) the HPD of the fetal head. AOP, angel of progression; HD, head direction; HPD, head progression distance.