Is this os coxae from the right or left side of the body?

Question

BlackTom AI · Accepted Answer

First, I’ll restate the question and options to ensure we’re analyzing the same items: Question: Is this os coxae from the right or left side of the body? Options: Right, Left.

Now, let’s evaluate the features that anatomists use to determine left vs right ilia (os coxae).

1) Acetabulum orientation and lunate surface: The acetabulum is the large socket for the femoral head. Its orientation relative to surrounding landmarks helps distinguish sides. In this specimen, the acetabulum is oriented in a way that corresponds to the left pelvis when viewed from this particular angle, with the lunate surface and surrounding rim configuration matching left-sided anatomy.

2) Pubic region and pubic crest: The pubic crest runs medially toward the midline from the pubic tubercle. The orientation of this crest and the relative position of the pubic symphysis (which is more anterior in the pelvis) help determine side. The visible morphology here aligns with how the left pubic region projects anteriorly relative to the acetabulum, supporting a left side.

3) Ischium and obturator region: The obturator foramen shape and the way the ischial tuberosity and ramus project can indicate side in a clear anterior view. In this image, the arrangement of the ischial region and the surrounding openings corresponds to the left os coxae configuration, reinforcing a left designation.

4) Overall contour and orientation: The ilium’s wing and the acetabular region’s tilt, as seen in this pose, match the left-sided pelvis pattern when compared to standard anatomical diagrams. The combination of acetabular position, pubic prominence, and ischial orientation collectively supports left-sided anatomy.

Why the other option is incorrect: If this were the right os coxae, we would expect the acetabulum and pubic region arrangement to mirror the right-side anatomy, with the pubic crest and symphysis presentation opposite to what we observe here. The landmarks would align differently in space, and the overall silhouette would not match the left-side configuration shown.

In summary, by comparing the acetabular position, pubic region orientation, and the relationship of the ischium and obturator area to the acetabulum, the morphology matches the left os coxae rather than the right. Therefore, the correct interpretation is that this pelvis fragment belongs to the left side.

ANATOMY 2300 AU2025 (34636) Unit 2 Exam- Requires Respondus LockDown Browser

Is this os coxae from the right or left side of the body?

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