Which of these statements about Scalenus anterior is true?
- Is an accessory muscle of respiration
- Lies anterior to the suprascapular artery
- Is pierced by the phrenic nerve
- Inserts into the scalene tubercle on the second rib
The Correct option is B
Explanation with High Yield Facts:
Scalenus anterior arises from the transverse processes of the third to six cervical vertebrae. It inserts into the scalene tubercle of the first rib. The subclavian vein passes anteriorly. The subclavian artery and brachial plexus pass posteriorly. The phrenic nerve lies on the anterior surface.
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