Muscles of the Thigh

Question 1

what muscles are in the anterior compartment of the thigh?

Answer 1

• iliopsoas
• sartorius
• quadratus femoris - rectus femoris, vastus lateralis, vastus medialis, vasteus intermedius
• pectineus

Question 2

muscles of the anterior thigh are innervated by what? what is their arterial supply?

Answer 2

femoral nerve - L2 - L4
arterial supply - femoral artery

Question 3

where does the iliopsoas pass under?

Answer 3

inguinal ligament

Question 4

iliopsoas is a combination of what two muscles?

Answer 4

psoas major muscle and iliacus

Question 5

what are the origins and insertions of iliopsoas?

Answer 5

origin - (psoas major) lumbar vertebrae and iliac fossa of pelvis (iliacus)
inserts - lesser trochanter of femur

Question 6

what are the actions of ilopsoas?

Answer 6

flexion of thigh at hip

Question 7

what is the longest muscle in the body?

Answer 7

sartorius

Question 8

what are the origins and insertions of sartorius?

Answer 8

origins - ASIS
inserts - superior, medial surface of tibia

Question 9

what are the actions of the sartorius?

Answer 9

hip - flexes, abducts, laterally rotates
knee - flexes

Question 10

what is the quadratus femoris made up of?

Answer 10

rectus femoris
vastus lateralis
vastus medialis
vastus intermedius

Question 11

what are the origins and insertions of rectus femoris

Answer 11

origin - AIIS and ilium
inserts - patella via quadriceps femoris tendon

Question 12

what are the origins and insertions of vastus lateralis

Answer 12

origins - greater trochanter and lateral lip of linea aspera
inserts - patella

Question 13

what are the origins and insertions of vastus medialis?

Answer 13

origin - interotrochanteric line and medial lip of linea aspera
inserts - patella

Question 14

what are the origins and insertions of vastus intermedius

Answer 14

origin - anterior and lateral surfaces of femoral shaft
inserts - patella

Question 15

what is the collective action of the quadratus femoris?

Answer 15

extension of the knee
(rectus femoris also flexes hip)

Question 16

what are the origins and insertions of the pectineus?

Answer 16

origin - pectineal line of pubis
inserts - pectineal line on posterior femus (inferior to lesser trochanter)

Question 17

what is the actions of the pectineus?

Answer 17

adducts and flexes hip

Question 18

Answer 18

Question 19

Answer 19

Question 20

Answer 20

Question 21

Answer 21

Question 22

what muscles are in the medial compartment of the thigh?

Answer 22

gracilis
obturator externus
adductor brevis
adductor longus
adductor magnus

Question 23

Answer 23

Question 24

Answer 24

Question 25

Answer 25

Question 26

what is the innervation of the muscles in the medial thigh?

Answer 26

obturator artery (L2-L4)

Question 27

what are the origins and insertions of obturator externus?

Answer 27

origin - membrane of obturator foramen inserts - posterior greater trochanter

Question 28

what are the actions of the obturator externus?

Answer 28

adduction and lateral rotation of thigh

Question 29

what are the origins and insertions of adductor longus

Answer 29

origins - pubis bone inserts - linea aspera of femur

Question 30

what are the actions of the adductor longus?

Answer 30

adducts thigh

Question 31

what are the origins and insertions of adductor magnus?

Answer 31

origin - inferior rami of pubis and ramus of ischium (adductor component) and ischial tuberosity (hamstring component) inserts - linea aspera (adductor component) and adductor tubercle of femur

Question 32

what are the actions of adductor magnus

Answer 32

adductor component - adduction and flexion of thigh hamstring component - adduction and extension

Question 33

what is the innervation of adductor magnus?

Answer 33

adductor - obturator nerve hamstring - tibial component of sciatic nerve

Question 34

what are the origins and insertions of adductor brevis

Answer 34

origin - body of pubis and inferior pubic rami inserts - linea aspera

Question 35

what is the action of the adductor brevis?

Answer 35

adduction

Question 36

what are the origins and insertions of gracilis?

Answer 36

origin - inferior rami of pubis and body of pelvis inserts - medial surface of tibial shaft

Question 37

what is the action of the gracilis?

Answer 37

adducts thigh at hip and flexes leg at knee

Question 38

what muscles are found in the posterior compartment of the thigh?

Answer 38

hamstrings - biceps femoris, semitendinous, semimembranous

Question 39

what are the origins and insertions of semitendinosus?

Answer 39

origin - ischial tuberosity of pelvis inserts - medial surface of tibia

Question 40

what are the actions of the semitendinosus?

Answer 40

flexes leg at knee extends thigh at hip medially rotates leg

Question 41

what is the innervation of semitendinosus and semimembranosus?

Answer 41

tibial part of sciatic nerve (L4-S3)

Question 42

what are the origins and insertions of semimembranosus

Answer 42

origin - ischial tuberosity (more superior than ST) inserts - medial tibial condyle

Question 43

what are the actions of semimembranosus?

Answer 43

flexes lef at knee extends thigh at hip medially rotates leg

Question 44

what is the most lateral muscle in the posterior compartment

Answer 44

biceps femoris

Question 45

what are the origins and insertions of biceps femoris

Answer 45

origin - ischial tuberosity (longhead) and linea aspera (short head) inserts - form tendon that inserts on head of fibula

Question 46

what are the actions of the biceps femoris?

Answer 46

flexion at knee extends thigh at hip laterally rotates leg

Question 47

what is the innervation of biceps femoris?

Answer 47

long head - tibial part of sciatic nerve short head - common fibular