Sho saphenous vein in a tributary of:
**Core Concept**
The small saphenous vein is a superficial vein of the leg, playing a crucial role in the venous drainage of the lower limb. It is part of the superficial venous system, which also includes the great saphenous vein. The small saphenous vein ascends from the lateral side of the foot to join a deeper vein in the thigh.
**Why the Correct Answer is Right**
The small saphenous vein typically joins the **popliteal vein**, a deep vein located behind the knee. This junction usually occurs within the popliteal fossa. The popliteal vein then continues as the **femoral vein** in the thigh, which eventually becomes the **external iliac vein** as it approaches the pelvic region. The small saphenous vein's drainage into the popliteal vein is an important anatomical landmark for understanding venous return from the lower limb.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because the small saphenous vein does not directly drain into the femoral vein; it first joins the popliteal vein.
**Option B:** Incorrect, as the great saphenous vein is another superficial vein that drains into the femoral vein but is not the direct recipient of the small saphenous vein's drainage.
**Option D:** This option is also incorrect because, while the small saphenous vein does ultimately contribute to the blood flowing through the external iliac vein, it does so indirectly through its junction with the popliteal vein and then the femoral vein.
**Clinical Pearl / High-Yield Fact**
Remembering that the small saphenous vein joins the popliteal vein is crucial for understanding the anatomy relevant to varicose vein treatments and diagnosing conditions like deep vein thrombosis. The junction of the small saphenous vein with the popliteal vein is a key landmark in venous anatomy of the lower limb.
**Correct Answer:** Correct Answer: C. popliteal vein.