What is the myotome pattern for knee flexion and hip extension?

The myotome pattern for knee flexion and hip extension primarily involves the nerve roots S1 and S2. Specifically, S1 contributes to the action of knee flexion due to its innervation of the hamstring muscles, while S2 also plays a significant role in knee flexion and is mainly responsible for hip extension through the gluteus maximus.

In this context, S2 is considered the most relevant choice since it directly impacts both actions of interest—knee flexion and hip extension. While S1 is associated with these movements as well, S2 is pivotal for the effective function of the involved muscles. Thus, recognizing S2 as the correct answer reflects an understanding of these key myotomal functions in joint movement.

The other nerve roots mentioned do not specifically relate to both knee flexion and hip extension in this context. L4, for example, primarily influences the quadriceps for knee extension rather than flexion. This distinction reinforces why S2 is the most accurate answer when considering both movements together.