During the surgical repair for a rotator cuff tear, a 65-year-old man received anesthesia injected between the left anterior and middle scalene muscle. C3-C7 roots are blocked through this process. Which of the following muscles would be affected by this procedure?

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Eductional Objective: The interscalene nerve block is regional anesthesia administered between the anterior and middle scalene muscle. It is done to block brachial plexus roots. It may lead to a phrenic nerve block, which paralyzes the ipsilateral diaphragm.

During the Surgical Repair for a Rotator Cuff Tear, a 65-Year-Old