## **Core Concept**
The gluteus medius muscle is one of the gluteal muscles located in the buttock region. It plays a crucial role in hip abduction and pelvic stabilization. The muscle is innervated by a branch of the sacral plexus.
## **Why the Correct Answer is Right**
The gluteus medius muscle is supplied by the **superior gluteal nerve**. This nerve originates from the sacral plexus, specifically from the L4, L5, and S1 nerve roots. The superior gluteal nerve is responsible for innervating the gluteus medius and minimus muscles, as well as the tensor fasciae latae muscle. It facilitates hip abduction and medial rotation.
## **Why Each Wrong Option is Incorrect**
* **Option A:** The inferior gluteal nerve primarily supplies the gluteus maximus muscle, not the gluteus medius.
* **Option B:** The sciatic nerve is a major nerve but does not specifically supply the gluteus medius muscle; it primarily supplies the posterior thigh muscles and the muscles of the leg.
* **Option D:** The pudendal nerve is involved in supplying the external genitalia and muscles of the perineum, not the gluteal muscles.
## **Clinical Pearl / High-Yield Fact**
A key clinical correlation to remember is that weakness of the gluteus medius muscle, often due to superior gluteal nerve damage or gluteus medius tendinopathy, can lead to a **Trendelenburg gait**. This is characterized by the pelvis tilting downwards on the contralateral side of the affected muscle during single-leg stance.