Glute medius
The masseter acts as the antagonist.
Piriformis-- A muscle in the pelvic girdle that is closely associated with the sciatic nerve.
The heart.
Piriformis
The piriformis originates at the anterior sacrum and inserts at the greater trochanter of the femur.
Piriformis
antagonist muscle
A antagonist muscle is a muscle that opposes the action of another muscle. The Triceps Brachii is the antagonist of the Biceps Brachii.
M. Piriformis
antagonist
the sarcum, the coccyx and the piriformis muscle
The condition is caused by the irritation or compression of the proximal sciatic nerve by the piriformis muscle, which connects the sciatic notch with the greater trochanter of the femur