What spinal roots innervate the triceps muscle responsible for elbow extension?

The triceps muscle, which plays a critical role in elbow extension, is primarily innervated by the radial nerve, which arises from spinal roots C6, C7, and C8. This innervation is significant because these spinal nerve roots contribute to the motor function needed for the triceps to contract and extend the elbow.

C6 is particularly important, as it supplies motor control to the proximal arm and assists in elbow flexion, while C7 and C8 directly contribute to the innervation of the triceps, enabling effective elbow extension. The coordination of these nerve roots ensures that the muscle functions properly during activities that involve pushing or extending the arm.

The other spinal roots listed in the options do not correspond to the innervation of the triceps muscle and are involved in other functions or muscle groups. Therefore, the selection of C6, C7, and C8 accurately reflects the specific spinal roots responsible for the triceps' motor function.