Main blood supply to the head and neck of femur comes from-
**Core Concept**
The head and neck of the femur receive their blood supply primarily from the medial and lateral circumflex femoral arteries, which are branches of the profunda femoris artery. This is a critical concept in understanding the vascular anatomy of the hip joint and femoral neck.
**Why the Correct Answer is Right**
The medial circumflex femoral artery supplies the posterior aspect of the femoral neck, while the lateral circumflex femoral artery supplies the anterior aspect. These arteries anastomose with each other and with the ascending branch of the obturator artery to form a rich network of vessels that supply the head and neck of the femur. This intricate vascular network is essential for the healing of fractures and the prevention of avascular necrosis.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not applicable as there is no direct blood supply coming from the external iliac artery to the head and neck of femur.
* **Option B:** This option is incorrect as the gluteal arteries primarily supply the gluteal region and do not directly contribute to the blood supply of the head and neck of the femur.
* **Option D:** This option is incorrect as the popliteal artery primarily supplies the knee joint and does not have a direct connection to the head and neck of the femur.
**Clinical Pearl / High-Yield Fact**
In cases of femoral neck fractures, the blood supply to the head of the femur can be compromised, leading to avascular necrosis. Understanding the blood supply to the head and neck of the femur is crucial in planning surgical interventions and predicting outcomes.
**Correct Answer: C. Medial and lateral circumflex femoral arteries.**