## **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 primarily 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 enables these muscles to perform their functions, including hip abduction and external rotation.

## **Why Each Wrong Option is Incorrect**
* **Option A:** The **inferior gluteal nerve** primarily supplies the gluteus maximus muscle. While it is also a branch of the sacral plexus, it is not responsible for innervating the gluteus medius.
* **Option B:** The **tibial nerve** is a larger branch of the sciatic nerve and primarily supplies muscles in the posterior thigh and leg. It does not innervate the gluteus medius.
* **Option C:** There seems to be an omission in the provided options; however, other nerves like the **common peroneal nerve** or **lateral femoral cutaneous nerve** do not supply the gluteus medius.

## **Clinical Pearl / High-Yield Fact**
A key clinical correlation to remember is the **Trendelenburg gait**, which is often seen in patients with a weakened gluteus medius muscle. This muscle plays a vital role in stabilizing the pelvis during the stance phase of gait. When it is weakened, patients may exhibit a characteristic lurching gait to compensate for the lack of hip abduction.

## **Correct Answer:** D. Superior gluteal nerve.