College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What muscle group does the long thoracic nerve innervate?

Serratus anterior
Deltoid
Latissimus dorsi
Infraspinatus

The correct answer is: Serratus anterior

The long thoracic nerve is primarily responsible for innervating the serratus anterior muscle. This muscle plays a crucial role in the movement of the scapula, particularly in protraction and upward rotation, which are essential for lifting the arms overhead. The serratus anterior ensures that the scapula stays flush against the rib cage, thereby stabilizing the shoulder girdle during various arm movements. Understanding this innervation is significant for both assessment and treatment in massage therapy, as dysfunction in the serratus anterior can lead to shoulder issues, scapular winging, and compromised overhead movement. This highlights the importance of the long thoracic nerve in maintaining proper shoulder mechanics and overall upper body function.