Synergists and Force Couples

Question 1

hip flexion

Answer 1

5 muscles:

• rectus femoris
• iliopsoas (iliacus and psoas major)
• pectineus
• tensor fascia lata
• sartorius

Question 2

hip extension

Answer 2

4 muscles:

• gluteus maximus
• semitendinosus
• semimembranosus
• biceps femoris long head

“hamstrings and gluteus maximus”

Question 3

hip abduction

Answer 3

4 muscles:

• gluteus medius
• gluteus minimus
• sartorius
• tensor fascia lata

“glute med, min, tfl, and sart”

Question 4

hip adduction

Answer 4

5 muscles:

• pectineus
• adductor longus
• adductor brevis
• adductor magnus
• gracilis

“adductors, pectineus, gracilis”

Question 5

hip internal rotation

Answer 5

3 muscles:

• gluteus medius
• gluteus minimus
• tensor fascia lata

“glute med, min and tfl”

“A-B ductors minus the sart”

Question 6

hip external rotation

Answer 6

8 muscles:

• gluteus maximus
• sartorius
• piriformis
• obturator externus
• obturator internus
• gemellus superior
• gemellus inferior
• quadratus femoris

“glute max, sart, and deep rotators”