Thigh Muscles

Question 1

action of vastus intermedius

Answer 1

extends leg at knee joint

Question 2

action of vastus medialis

Answer 2

extends leg at knee joint

Question 3

action of vastus lateralis

Answer 3

extends leg at knee joint

Question 4

action of rectus femoris

Answer 4

extends leg at knee joint

flexes thigh at hip joint

Question 5

What are the muscles of the anterior thigh
what action do they have in common
what is there innervation

Answer 5

rectus femoris
vastus medialis
vastus lateralis 
rectus femoris 
sartorius

all extend leg at knee (except sartorius)

femoral nerve
(L2-4)

Question 6

action of sartorius

Answer 6

flexes thigh at hip joint

flexes leg at knee joint

Question 7

What are the muscles of the medial thigh
what action do they have in common
what is their innervation

Answer 7

gracilis
adductor longus
adductor brevis
adductor Magnus 
pectineus
obturator externes 

adduct the thigh at the hip (except obturator externus)

obturator nerve (L2-4)
(except pectineus = femoral)

Question 8

action of gracilis

Answer 8

adducts thigh at hip

flexes leg at knee

Question 9

action of adductor brevis

Answer 9

adducts thigh at hip

Question 10

action of adductor longus

Answer 10

adducts thigh at hip

medially rotates thigh at hip

Question 11

action of adductor Magnus

Answer 11

adducts thigh at hip

medially rotates thigh at hip

Question 12

action of pectineus

Answer 12

adducts thigh at hip

flexes thigh at hip

Question 13

action of obturator externus

Answer 13

laterally rotates thigh at hip

found at back of medial compartment

Question 14

What are the muscles of the gluteal region

Answer 14

glut max
glut med
glut min
tensor fascia latae

gemellus superior
gemellus interior
quadratus femoris
obturator internus

Question 15

actions of gluteus Maximus

Answer 15

extends a flexed femur at the hip

abducts the thigh at the hip

laterally rotates the thigh at the hip

lateral stabiliser of hip AND knee joint

Question 16

innervation of gluteus Maximus

Answer 16

inferior gluteal nerve

L5 - S2

Question 17

actions of gluteus medius and minimus

Answer 17

abducts thigh at hip joint

medially rotates thigh at hip

holds pelvis secure over stance leg and prevents pelvic drop on the opposite side during walking

Question 18

actions of tensor fascia latae

Answer 18

stabilises knee in extension

Question 19

innervation of gluteus medius, gluteus minimus and tensor fascia latae

Answer 19

superior gluteal nerve

L4-S1

Question 20

Common action of gemellus superior, inferior and obturator internus

Answer 20

Laterally rotates the extended thigh at the hip

abduction of flexed thigh at hip

Question 21

action of quadratus femoris

Answer 21

laterally rotates thigh at hip

Question 22

innervation of gemellus superior and obturator internus

Answer 22

nerve to obturator internus

L5-S1

Question 23

innervation of gemellus inferior and quadratus femoris

Answer 23

nerve to quadratus femoris

L5-S1

Question 24

Innervation of the posterior compartment of the thigh

Answer 24

Sciatic nerve

L5-S2

Question 25

actions of biceps femoris

Answer 25

extends thigh at hip joint

flexes knee joint

laterally rotates thigh at hip joint

laterally rotates leg at knee joint

Question 26

actions of semimembranosus and semitendinosus

Answer 26

extends thigh at hip joint

flexes leg at knee joint

medially rotates thigh at hip joint

medially rotates leg at knee joint