Question

Posterior wall of axilla is formed by?

• A. Pectoralis major
• B. Pectoralis minor
• C. Subscapularis
• D. Intercostal muscles

Hint:

The subscapular wall is named after the muscle that caps it superiorly.

Answer 1

The Correct Option is C

Step 1: The axilla is a pyramidal space between the upper arm and chest wall, with an apex, a base, and four walls (anterior, posterior, medial, and lateral).

Step 2: The posterior (subscapular) wall is formed by three muscles: subscapularis above, with teres major and latissimus dorsi below. So among the options, subscapularis is the correct posterior wall component.

Step 3: The other options belong to different walls. Pectoralis major and pectoralis minor form the anterior (pectoral) wall along with subclavius, and the intercostal muscles (with upper four ribs and serratus anterior) form the medial (thoracic) wall.

Step 4: Therefore, the posterior wall of the axilla is formed by subscapularis.