Which spinal reflex is associated with the triceps?

• A. C6
• B. C7
• C. L5
• D. S1

Answer: (B)

The spinal reflex associated with the triceps is primarily linked to the C7 spinal nerve root. This reflex involves the activation of the musculocutaneous nerve, which innervates the triceps brachii muscle. When the triceps tendon, located at the elbow, is tapped, it stimulates the stretch receptors in the muscle. This prompts an immediate response through the spinal cord, resulting in the extension of the elbow.

The C7 spinal nerve is crucial here because it is the nerve root that is responsible for the motor function of the triceps. Additionally, the reflex arc involving C7 allows for an efficient neural pathway, resulting in a quick muscular contraction in response to the stimulus. Understanding this reflex is essential in the assessment of neurological function and musculature of the upper limb, especially in athletic training and rehabilitation settings.