94A Kinesiology Practice Exam

Which scalene inserts on the second rib?

Anterior scalene Levator scapulae Posterior scalene Middle scalene

Correct Answer:

Posterior scalene

Explanation:

The key idea is where the scalene muscles attach to the ribs. Among the scalene trio, the anterior and middle scalene insert on the first rib, while the posterior scalene inserts on the second rib. The levator scapulae is not a scalene and does not attach to a rib at all—its insertion is on the scapula. So, when asked which scalene attaches to the second rib, the posterior scalene is the one that fits that insertion pattern. It elevates the second rib during forced inspiration, aligning with its placement.

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