Which letter is labelling the common iliac vein?

Question

BlackTom AI · Accepted Answer

The common iliac vein is a paired vessel formed by the union of the internal and external iliac veins near the pelvic brim; the two common iliac veins then join at about the level of L5 to form the inferior vena cava (IVC). In anatomical images veins are usually shown in blue and course from the lower limb/pelvis upward toward the midline to form the IVC.

Step 1 — Relevant concepts:
- Location: common iliac veins lie in the pelvis, lateral to the sacrum and medial to the pelvic bones, and ascend to join and form the IVC.
- Relationships: the IVC is midline and superior to the common iliac junction; thoracic veins (azygos, superior vena cava) are much higher in the thorax.

Step 2 — Step-by-step reasoning:
- Locate the pelvis in the figure: the lowest labeled region (near the hip bones) shows two large blue veins ascending from each lower limb/pelvis toward the midline.
- The arrow labeled E points to one of these lateral ascending pelvic veins right before they converge; this matches the anatomical position of a common iliac vein.
- The arrow labeled D points just above that junction at the midline to the single large vertical vein (the IVC), which is formed by the union of the common iliac veins.
- Arrows A, B, C are positioned high in the thorax (upper chest and along the vertebral column), so they label thoracic venous structures, not pelvic veins.

Step 3 — Calculations: none required.

Why E is correct:
- E marks a lateral pelvic vein ascending toward the midline immediately before the formation of the IVC, which is exactly where a common iliac vein is located.

Why other choices are incorrect:
- A and B label thoracic venous structures (brachiocephalic/SVC region or azygos arch area).
- C labels a thoracic/vertebral venous channel along the rib cage.
- D labels the midline inferior vena cava just above where the common iliacs join.

Conclusion: The correct answer is E, which matches the provided answer.

Which letter is labelling the common iliac vein? Single choice

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