This document summarizes the origins, insertions, actions and roles of various muscles around the hip and knee. It describes the rectus femoris, vastus intermedius, vastus lateralis, vastus medialis and other quadriceps muscles as knee extensors and hip flexors. It also outlines the hamstrings muscles and their actions as knee flexors and hip extensors. Additionally, it provides details on stabilizer muscles like the tensor fasciae latae, sartorius, gracilis, popliteus and others. The roles of these muscles in dynamic stabilization of the joints are emphasized.