Question

Identify the blue – colored area shown in the image below

• A. Obstetric outlet
• B. Anatomical outlet
• C. Pelvic inlet
• D. Midpelvis

Answer 1

The Correct Option is D

To identify the blue-colored area shown in the image with respect to the options provided, it is important to understand the different parts of the pelvis relevant to obstetrics. The pelvis plays a crucial role in childbirth, and obstetricians focus on three main sections of the pelvis: the pelvic inlet, midpelvis, and pelvic outlet.

1. Pelvic Inlet: This is the upper opening of the true pelvis. It is bounded by the linea terminalis, which includes the pubic crest, pecten pubis, arcuate line of the ilium, and the sacral promontory. It serves as the entryway for the fetal head into the birth canal.

2. Midpelvis: The midpelvis, also known as the true pelvis, is the region between the pelvic inlet and outlet. The dimensions and shape of the midpelvis are crucial during childbirth as this is typically the narrowest part that the fetus must pass through. It is bounded by the sacrum and coccyx dorsally, the pubic symphysis ventrally, and the ischial spines on each side.

3. Obstetric Outlet: This is the lower part of the pelvis that the fetus finally passes through during childbirth. It is bounded by the pubic arch anteriorly, the ischial tuberosities laterally, and the tip of the coccyx posteriorly. It is important for the dimensions to allow passage for the fetal head.

4. Anatomical Outlet: This is similar to the obstetric outlet but defined strictly as the bony marginal structure of the pelvic outlet without consideration of the soft tissues.

In the image provided, the blue-colored area represents the midpelvis, as it is the central part of the pelvis located between the pelvic inlet and the outlet. This confirms the correct answer is "Midpelvis".