| | Conditions Treatments | Muscle Strain What muscles can be antagonistic to themselves? The rectus femoris muscle can be considered an antagonist to itself because it both flexes and extends the knee. Muscle Strain - Related Articles How are thoughts formed in the mind? What You Need to Apply for Medicaid? What are Anti-Glare Glasses? How to Sharpen Memory Middle-Aged Men & Heart Disease Medical term surgucal punture of the thoracic cavity? What can an abnormally high white blood cell count in urine mean?