Which of the following muscles are part of the knee group?

The quadriceps are a group of muscles located at the front of the thigh and are primarily responsible for extending the knee joint. This muscle group plays a critical role in various movements such as walking, running, jumping, and squatting, all of which involve knee extension. The quadriceps comprise four individual muscles: the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. Their main function in terms of knee stability and movement makes them a fundamental part of the knee group.

In contrast, the other muscles listed are not responsible for actions related to the knee. The gluteus medius is primarily involved in hip stabilization and movement. The transverse abdominis is a deep abdominal muscle that helps with core stability but does not directly influence knee function. The obliques are involved in trunk rotation and lateral flexion and also do not play a role at the knee joint. This understanding clarifies why the quadriceps are appropriately categorized within the knee group.