Which portion of the serratus anterior is most accessible?

• A. Superior to the axilla
• B. Inferior to the axilla
• C. Medial to the scapula
• D. Lateral to the spine

Answer: (B)

The part of the serratus anterior that is most accessible sits along the lateral chest wall below the armpit. This inferior region lies on the surface where the muscle fibers extend toward the lower ribs, with relatively little overlying scapular cover or thick muscle layers, making it easier to palpate and identify. In contrast, the portion near the top under the clavicle and pectoralis major, or the area closest to the medial scapula, is more protected by bones and other muscles, and the region near the spine isn’t where this muscle runs most superficially. So, the inferior to the axilla portion is the easiest to reach and feel.