The psaos major and the iliacus muscles are distinct in the abdomen and unite at the level of the inguinal ligament to form the iliopsoas muscle in the thigh. The iliopsoas muscle crosses the hip joint and inserts on to the lesser trochanter of the femur. The iliopsoas is involved in flexion and lateral rotation of the thigh. It is the strongest of the hip flexors, and is important in standing, walking, and running.

The gluteus medius, gluteus minimus, and piriformis insert onto the greater trochanter. 

The flexor digitorum brevis lies in the middle of the sole of the foot above the plantar aponeurosis. It arises from a tendon from the medial process of the calcaneus, it continues towards the toes and divides into four tendons, one for each of the four lesser toes. It is innervated by the medial plantar nerve. The tibialis posterior, extensor digitorum longus, and soleus all cross the ankle joint thus having leverage above it. 

The biceps femoris inserts on the lateral surface of the fibular head. The other muscles of the hamstring insert of the medial surface of the tibia.

The only muscle listed that is not innervated by the obturator nerve is flexor hallucis longus, as this is innervated by the tibial nerve, as well as the S2 and S3 nerve roots. Flexor hallucis longus runs from the fibula distally to the plantar surface of the foot, and functions to flex the joints of the big toe and plantar flex the ankle joint. 

The other muscles listed (adductor brevis, adductor minimus, adductor longus, and gracilis) are thigh muscles that are all innervated by the obturator nerve, and they collectively function to adduct the hip.

Adductor magnus is a large muscle, consisting of two parts, located at the medial side of the thigh. One portion of the muscle originates at the ischiopubic ramus (called the pubofemoral portion) while the other portion originates from the ichial tuberosity (called the ischiocondylar portion). The adductor magnus inserts onto the linea aspera above the knee. The biceps femoris (long and short heads), semitendinosus, and semimembranosus all insert below the knee thus having leverage about the knee.

The hamstring muscle group is responsible for knee flexion. The quadriceps muscle group is responsible for knee extension. The posterior muscle group is not an anatomical muscle group. The biceps muscle group is located in the upper arm, and produces elbow flexion.

The rectus femoris belongs to the quadriceps muscle group. The hamstring muscle group consists of: biceps femoris, which is located most lateral, and semimembranosus, and semitendinosus which is located most medially.

Vastus medialis is most medial (medialis) as well as most distal. Rectus femoris is located most medially to the leg, but not the body, which is what is used as reference when looking at anatomical position. Vastus lateralis (lateral) and Vastus medialis (medial) are also not correct as they do not fit the description of both medical and distal. Finally the sartorius is not part of the quadriceps muscle group. 

The soleus is one part of the calf muscle, and is deep to the gastrocnemius. This muscle inserts via the achilles tendon to the calcaneus and allows for plantarflexion of the foot. 

The tibial tuberosity is located at the proximal anterior portion of the tibia, and the navicular tuberosity and 1st cuniform are located in the midfoot and are insertion points for medial and lateral muscles of the foot and lower leg.

The muscles that insert to the achilles tendon allow for plantarflexion of the foot, which is created due to shortening of the posterior muscles of the lower leg. Dorsiflexion is created through the anterior muscles of the lower leg. Eversion is created through the lateral muscles, and inversion is created with the medial muscles. Abduction is the motion of moving a body part away from the midline.