Axis aery of lower limb is derived from ?
**Core Concept**
The axis artery of the lower limb is a vital structure that supplies blood to the entire limb, originating from the external iliac artery. This concept is crucial in understanding the anatomy and hemodynamics of the lower limb.
**Why the Correct Answer is Right**
The axis artery of the lower limb is derived from the external iliac artery, specifically from the common iliac artery, which is a major branch of the abdominal aorta. This is due to the embryological development of the lower limb, where the common iliac artery gives rise to the external iliac artery, which then becomes the axis artery of the lower limb.
* The external iliac artery is responsible for supplying blood to the lower limb, making it the axis artery.
* The common iliac artery is the main supplier of blood to the lower limb, and its branch, the external iliac artery, becomes the axis artery.
* The internal iliac artery is primarily responsible for supplying blood to the pelvic organs and is not the axis artery of the lower limb.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the femoral artery is a major branch of the external iliac artery but is not the axis artery of the lower limb.
* **Option B:** This option is incorrect because the common femoral artery is a term used to describe the external iliac artery where it passes through the inguinal ligament, but it is not the axis artery of the lower limb.
* **Option C:** This option is incorrect because the internal iliac artery is primarily responsible for supplying blood to the pelvic organs and is not the axis artery of the lower limb.
**Clinical Pearl / High-Yield Fact**
The axis artery of the lower limb is a critical structure that supplies blood to the entire limb, making it a vital landmark for vascular surgeons and radiologists.
**Correct Answer: C. External iliac artery.**