Medial border of triangle of auscultation is
**Core Concept**
The triangle of auscultation is a small triangular area of the back where the sounds of respiration can be heard most clearly. It is bounded by the **latissimus dorsi**, **trapezius**, and **scapula** muscles. The medial border is particularly relevant for anatomical identification.
**Why the Correct Answer is Right**
The medial border of the triangle of auscultation is formed by the **serrated edge of the scapula** or more specifically, the medial border of the scapula, which is where the scapula meets the ribs. This anatomical landmark is crucial for clinical examination.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because the trapezius forms the superior border.
**Option B:** Incorrect because the latissimus dorsi forms the lateral border.
**Option D:** Incorrect as it does not correctly represent the anatomical structure forming the medial border.
**Clinical Pearl / High-Yield Fact**
The triangle of auscultation is an important area for clinicians to assess respiratory sounds, such as breath sounds, wheezes, or crackles, which can indicate various respiratory conditions.
**Correct Answer:** C. Medial border of scapula