## **Core Concept**
Intramuscular injections in the buttock are administered to avoid injury to the **sciatic nerve** and **superior gluteal nerve**, which are located in this region. The buttock is divided into four quadrants to ensure safe administration of injections.

## **Why the Correct Answer is Right**
The correct quadrant for administering intramuscular injections in the buttock is the **upper outer quadrant**. This is because the sciatic nerve runs down the lower part of the buttock and the superior gluteal nerve, which supplies the gluteus medius and minimus muscles, is located in the upper part but closer to the outer aspect. Injecting in the upper outer quadrant minimizes the risk of damaging these nerves.

## **Why Each Wrong Option is Incorrect**
- **Option A:** The upper inner quadrant is incorrect because it is closer to the **superior gluteal nerve**, increasing the risk of nerve damage.
- **Option B:** The lower inner quadrant is incorrect as it may be closer to the **sciatic nerve**, posing a risk of nerve injury.
- **Option D:** The lower outer quadrant, while seemingly safe, is not the preferred site as it might still pose a risk to the **sciatic nerve** and is not as muscular as the upper outer quadrant.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is the **gluteal cleft** or natal cleft ends just below the level of the coccyx and between the buttocks; injections should not be given here or in the lower parts of the buttock to avoid nerve damage. Always use the upper outer quadrant for safe administration.

## **Correct Answer:** . Upper outer quadrant.