**Core Concept**
The scapula, also known as the shoulder blade, is a triangular bone that forms the posterior aspect of the shoulder joint. The scapula has three borders: the superior border, the medial border, and the lateral border. These borders are palpable and can be used as anatomical landmarks for various clinical procedures.

**Why the Correct Answer is Right**
The superior border of the scapula is not palpable due to its location and the overlying muscles. The superior border is situated at the top of the scapula and is overlapped by the trapezius muscle, which makes it difficult to palpate. In contrast, the medial and lateral borders are palpable as they are located on the sides of the scapula and are not overlapped by any muscles.

**Why Each Wrong Option is Incorrect**
* **Option A:** The superior border is not palpable, but the other borders are palpable, making this option incorrect.
* **Option B:** The medial border is palpable, so this option is incorrect.
* **Option C:** The lateral border is palpable, making this option incorrect.
* **Option D:** This option is not provided, but the correct answer will be provided below.

**Clinical Pearl / High-Yield Fact**
The borders of the scapula are important anatomical landmarks for various clinical procedures, such as injections and biopsy. Knowing the location and palpability of these borders is essential for safe and effective clinical practice.

**Correct Answer:** .