Inferior angle of scapula lies at what level?

**Core Concept**
The inferior angle of the scapula is a landmark used in physical examination and clinical assessments, particularly in the evaluation of scapular rotation and winging. It is a key anatomical structure in the posterior thoracic wall.

**Why the Correct Answer is Right**
The inferior angle of the scapula lies at the level of the 7th thoracic vertebra (T7) in the mid-clavicular line. This is due to the scapula's curved shape and its position on the posterior thoracic wall. The scapula's inferior angle is a consistent landmark used in clinical assessments to evaluate scapular rotation and winging, which can be indicative of underlying muscle imbalances or neurological disorders.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because the inferior angle of the scapula is not at the level of T1, which is higher up in the thoracic spine.
**Option B:** Incorrect because the inferior angle of the scapula is not at the level of the 2nd thoracic vertebra (T2), which is too low.
**Option C:** Incorrect because the inferior angle of the scapula is not at the level of the 10th thoracic vertebra (T10), which is too low.

**Clinical Pearl / High-Yield Fact**
The inferior angle of the scapula can be used as a landmark to assess scapular rotation and winging, which can be indicative of underlying muscle imbalances or neurological disorders. Clinicians should be aware of the scapula's normal position and movement to accurately diagnose and manage scapular-related pathologies.

**Correct Answer: D. 7th thoracic vertebra (T7)**