Which myotome corresponds to shoulder abduction?

Shoulder abduction is primarily associated with the C5 myotome, which innervates the deltoid and supraspinatus muscles responsible for this action. The C5 nerve root plays a crucial role in the movement of raising the arm away from the body, making it the key myotome for shoulder abduction. This understanding is essential for evaluating motor function in patients with specific nerve root injuries or conditions affecting the cervical spine. Recognizing the role of C5 also aids in developing appropriate rehabilitation strategies and understanding the implications for upper extremity function. Other myotomes, such as C3 and C4, may affect shoulder elevation but are not directly responsible for the specific action of abduction.