What is the function of the C3 myotome?

The C3 myotome is responsible for specific movements controlled by the muscles innervated by the third cervical spinal nerve. The primary function associated with this myotome is cervical lateral flexion, which involves tilting the head to the side. This action is primarily facilitated by the muscles innervated by C3, such as the sternocleidomastoid and some of the upper trapezius fibers.

The focus on lateral flexion connects to the anatomical and functional location of the C3 nerve root, illustrating its role in neck mobility. It is crucial for practitioners in orthotics and prosthetics to understand these myotomes for effective evaluation and treatment planning, as it aids in identifying which muscles may be compromised following injury or disease. Describing muscle control in functional terms, such as cervical motion, emphasizes the myotome's importance in daily activities involving head and neck position.

In contrast, shoulder abduction is primarily associated with the deltoid and the supraspinatus, which are innervated by higher cervical roots (such as C5). Wrist flexion involves the musculature innervated by the C6 and C7 nerve roots, while hip flexion is mainly controlled by the lumbar plexus, particularly nerves