North American Registry of Midwives (NARM) Practice Exam

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Which pelvic type is associated with longer crowning and a tendency for posterior positioning of the baby?

Platypelloid
Anthropoid
Gynecoid
Android

The correct answer is: Anthropoid

The anthropoid pelvic type is characterized by its elongated oval shape, with a broader anteroposterior diameter compared to the transverse diameter. This shape can lead to longer crowning periods during labor. When the baby moves through the birth canal, the unique shape often results in a tendency for the baby to assume a posterior position, which can complicate the labor process. The posterior position can increase the duration of labor, as the fetal head may not fit optimally through the pelvic inlet and outlet, leading to a more challenging delivery. Midwives and healthcare providers are trained to recognize the implications of pelvic types on labor and delivery processes. In the case of anthropoid pelvises, a prolonged labor may require additional monitoring and potentially the use of interventions to facilitate the delivery, making it crucial for practitioners to be aware of the maternal pelvic type during prenatal assessments.