Final answer:
The femoral vein is commonly used in pediatric critical care units for non-tunneled catheter placement due to its accessibility and large size.
Step-by-step explanation:
The femoral vein is commonly used in pediatric critical care units for non-tunneled catheter placement due to its accessibility and large size. It is located on the medial surface of the leg and thigh, and it drains the superficial and deep portions of these areas. Additionally, the femoral vein receives blood from other veins such as the great saphenous vein, deep femoral vein, and femoral circumflex vein.