Answer
1. **Convergence of Internal and External Iliac Veins to Form Common Iliac Vein:** The internal iliac vein drains blood from the pelvic region, while the external iliac vein drains blood from the lower extremities. These two veins converge to form the common iliac vein on each side of the body. This occurs at the level of the pelvic brim, which is the border between the pelvic and abdominal cavities.
2. **Convergence of Right and Left Common Iliac Veins to Form Inferior Vena Cava (IVC):** The common iliac veins from both sides of the body, i.e., the right and left, come together at the level of the fifth lumbar vertebra to form the inferior vena cava (IVC). The inferior vena cava is a large vein that carries deoxygenated blood from the lower half of the body to the right atrium of the heart.
These convergences of veins play a critical role in the venous drainage of the lower body and the return of deoxygenated blood to the heart. For more detailed and specific information, including the details from the specific table you mentioned, I recommend consulting an anatomy textbook or medical resource.
Work Step by Step
1. **Convergence of Internal and External Iliac Veins to Form Common Iliac Vein:** The internal iliac vein drains blood from the pelvic region, while the external iliac vein drains blood from the lower extremities. These two veins converge to form the common iliac vein on each side of the body. This occurs at the level of the pelvic brim, which is the border between the pelvic and abdominal cavities.
2. **Convergence of Right and Left Common Iliac Veins to Form Inferior Vena Cava (IVC):** The common iliac veins from both sides of the body, i.e., the right and left, come together at the level of the fifth lumbar vertebra to form the inferior vena cava (IVC). The inferior vena cava is a large vein that carries deoxygenated blood from the lower half of the body to the right atrium of the heart.
These convergences of veins play a critical role in the venous drainage of the lower body and the return of deoxygenated blood to the heart. For more detailed and specific information, including the details from the specific table you mentioned, I recommend consulting an anatomy textbook or medical resource.
