Muscles of Ant Thigh

Question 0

sartorius

Answer 0

O: ASIS, sup part of notch inf to it
I: sup part of medial surface of tibia
N: femoral nerve L2, L3
A: flexes, abducts and laterally rotates thigh at hip joint 
	flexes leg at knee joint

Question 1

pectineous

Answer 1

O: superior ramus of pubis
I: pectineal line of femur just inf to lesser trochanter
N: femoral nerve L2, L3
A: adducts and flexes thigh
	assists w/ medial rotation of thigh

Question 2

psoas major

Answer 2

O: sides of T12-L5 vertebrae and discs b/w them
transverse processes of all lumbar vertrbra
I: lesser trochanter
N: ant rami of lumbar nerves L1, L2, L3
A: active during standing;
works w/ iliacus in flexing and stabilizing hip joint

Question 3

iliacus

Answer 3

O: iliac fossa, iliac crest, ala of sacrum, ant SI ligaments
I: tendon of psoas major, lesser trochanter, femur distal to it
N: femoral nerve L2, L3
A: acts w/ psoas major to flex and stabilize hip joint

Question 4

rectus femoris

Answer 4

O: ASIS and ilium sup to acetabulum
I: base of patella via quadriceps tendon
indirectly to tibial tuberosity via patellar tendon
N: femoral nerve L2, L3, L4
A: extends leg at knee joint, steadies hip joint,
helps iliopsoas flex thigh

Question 5

vastus lateralis

Answer 5

O: greater trochanter and lateral lip of linea aspera
I: base of patella via quadriceps tendon
indirectly to tibial tuberosity via patellar tendon
tibia and patella via aponeuroses
N: femoral nerve L2, L3, L4
A: extends leg at knee joint

Question 6

vastus medialis

Answer 6

O: intertrochanteric line and medial lip of linea aspera
I: base of patella via quadriceps tendon
indirectly to tibial tuberosity via patellar tendon
tibia and patella via aponeuroses
N: femoral nerve L2, L3, L4
A: extends leg at knee joint

Question 7

vastus intermedius

Answer 7

O: ant and lat surfaces of shaft of femur
I: base of patella via quadriceps tendon
indirectly to tibial tuberosity via patellar tendon
N: femoral nerve L2, L3, L4
A: extends leg at knee joint