**Question:** Gluteus medius is supplied by

A. Tensor fasciae latae artery
B. External iliac artery
C. Superficial circumflex iliac artery
D. Internal iliac artery

**Correct Answer:** Gluteus medius is supplied by the tensor fasciae latae artery.

**Core Concept:**
Understanding the arterial supply to the gluteal muscles is crucial for understanding their function and potential complications in clinical scenarios. The gluteal muscles, including the gluteus medius, are responsible for hip abduction and external rotation. They are innervated by the sacral plexus, but their blood supply arises from various sources.

**Why the Correct Answer is Right:**
The gluteus medius receives its arterial supply from the tensor fasciae latae artery, which is a branch of the external iliac artery. This artery supplies the muscles of the lateral thigh and gluteal region, allowing the gluteus medius to get adequate oxygen and nutrients to function properly.

**Why Each Wrong Option is Incorrect:**
1. **A: Tensor fasciae latae artery** is incorrect because it supplies the lateral thigh muscles and skin, not the gluteal muscles.
2. **B: External iliac artery** is incorrect because it is the parent vessel supplying the tensor fasciae latae artery, not directly supplying the gluteus medius.
3. **C: Superficial circumflex iliac artery** is incorrect as it supplies the anterior and lateral thigh muscles, not the gluteal muscles.
4. **D: Internal iliac artery** is incorrect as it supplies the muscles of the posterior and medial thigh, not the lateral thigh and gluteal muscles.

**Clinical Pearl:**
Understanding the anatomy and blood supply of the gluteal muscles is essential for interpreting clinical presentations in patients with gluteal muscle injuries, weakness, or infarcts. A thorough history and physical examination can help identify these issues, and knowledge of the blood supply can aid in formulating a differential diagnosis and treatment plan.

**Why the Correct Answer is Right:**
The tensor fasciae latae artery is a branch of the external iliac artery. The external iliac artery is a continuation of the common iliac artery, which arises from the abdominal aorta. The tensor fasciae latae artery supplies the lateral thigh muscles (quadriceps femoris, vastus lateralis, vastus intermedius, and vastus lateralis) and the skin overlying the lateral thigh and gluteal region.

**Why Each Wrong Option is Incorrect:**
1. **A: Tensor fasciae latae artery** supplies the lateral thigh muscles, not the gluteal muscles.
2. **B: External iliac artery** is incorrect because it is a parent vessel and does not directly supply the gluteal muscles. It gives rise to the tensor fasciae latae artery supplying the lateral thigh muscles and the skin overlying the lateral thigh and gluteal region.
3. **C: Superficial