Thigh and Knee Muscle Actions + Innervations

Question 1

rectus femoris innervation

Answer 1

femoral nerve

Question 2

rectus femoris action

Answer 2

knee extension
hip flexion

Question 3

vastus lateralis innervation

Answer 3

femoral nerve

Question 4

vastus lateralis action

Answer 4

knee extension

Question 5

vastus intermedius innervation

Answer 5

femoral nerve

Question 6

vastus intermedius action

Answer 6

knee extension

Question 7

vastus medialis innervation

Answer 7

femoral nerve

Question 8

vastus medialis action

Answer 8

knee extension

Question 9

sartorius innervation

Answer 9

femoral nerve

Question 10

sartorius action

Answer 10

hip flexion
hip abduction
hip external rotation
knee flexion

Question 11

iliopsoas innervation

Answer 11

iliacus: femoral nerve
psoas: ventral rami L1-L3 of lumbar plexus

Question 12

iliopsoas action

Answer 12

hip flexion
hip external rotation
trunk flexion at hip

Question 13

pectineus innervation

Answer 13

femoral nerve

Question 14

pectineus action

Answer 14

hip flexion
hip adduction

Question 15

obturator externus innervation

Answer 15

obturator nerve

Question 16

obturator externus action

Answer 16

hip external rotation

Question 17

gracilis innervation

Answer 17

obturator nerve

Question 18

gracilis action

Answer 18

hip adduction
knee flexion

Question 19

adductor longus innervation

Answer 19

obturator nerve

Question 20

adductor longus action

Answer 20

hip adduction
hip internal rotation

Question 21

adductor brevis innervation

Answer 21

obturator nerve

Question 22

adductor brevis action

Answer 22

hip adduction
hip internal rotation

Question 23

adductor magnus innervation

Answer 23

adductor part: obturator nerve
hamstring part: tibial division of sciatic nerve

Question 24

adductor magnus action

Answer 24

adductor part: hip adduction + internal rotation
hamstring part: hip extension

Question 25

biceps femoris innervation

Answer 25

long head: tibial division of sciatic nerve
short head: common fibular division of sciatic nerve

Question 26

biceps femoris action

Answer 26

long head: hip extension
both heads: flexion and external rotation at knee

Question 27

semitendinosus innervation

Answer 27

tibial division of sciatic nerve

Question 28

semitendinosus action

Answer 28

hip extension
flexion + internal rotation at knee

Question 29

semimembranosus innervation

Answer 29

tibial division of sciatic nerve

Question 30

semimembranosus action

Answer 30

hip extension
flexion + internal rotation at knee