A pelvis characterized by an anteroposterior diameter of the inlet greater than the transverse diameter is classified as:
**Core Concept**
The classification of the pelvic inlet into different types is crucial in obstetrics, as it affects the ease of labor and delivery. The anteroposterior (AP) diameter of the pelvic inlet is the distance between the sacral promontory and the pubic symphysis, while the transverse diameter is the distance between the two iliopectineal lines.
**Why the Correct Answer is Right**
An anthropoid pelvis is characterized by an AP diameter of the inlet greater than the transverse diameter. This type of pelvis is often seen in women of African descent and is associated with a more favorable obstetric outcome. The AP diameter is typically longer than the transverse diameter due to the wider and more curved shape of the inlet. This allows for a more efficient passage of the fetal head during labor.
**Why Each Wrong Option is Incorrect**
**Option A:** The gynecoid pelvis is characterized by a transverse diameter greater than the AP diameter, which is the opposite of the anthropoid pelvis.
**Option B:** The android pelvis is characterized by a narrow AP diameter and a wider transverse diameter, often seen in women with a more masculine pelvis shape.
**Option D:** The platypelloid pelvis has a wide transverse diameter, but the AP diameter is narrower than the transverse diameter, which is not characteristic of the anthropoid pelvis.
**Clinical Pearl / High-Yield Fact**
It's essential to recognize the different types of pelvic inlets to predict potential difficulties in labor and delivery. An anthropoid pelvis is generally considered the most favorable type for childbirth, but other types may require closer monitoring and possible intervention.
**Correct Answer:**
✓ Correct Answer: C. Anthropoid