Anterior Thigh Muscles

Question 0

Tensor fasciae latae

Answer 0

O: iliac crest, posterior to ASIS
I: iliotibial tract
A: flex thigh, medially rotate thigh, abduct thigh
Inn: superior gluteal N (L4-S1)

Question 1

Sartorius

Answer 1

O: ASIS
I: medial surface of proximal tibia, distal to tibial tuberosity
A: flex thigh, abduct thigh, laterally rotate thigh; flex leg
Inn: femoral (L2-3)

Question 2

Rectus femoris

Answer 2

O: AIIS, ilium above acetabulum
I: patella through patellar ligament to tibial tuberosity
A: extend leg, flex thigh
Inn: femoral (L2-4)

Question 3

Vastus medialis

Answer 3

O: medial lip of linea aspera; lower part of intertrochanteric line
I: patella through patellar ligament to tibial tuberosity
A: extend leg
Inn: femoral (L2-4)

Question 4

Vastus lateralis

Answer 4

O: lateral lip of linea aspera of femur; limited origin from intertrochanteric line
I: patella through patellar ligament to tibial tuberosity
A: extend leg
Inn: femoral (L2-4)

Question 5

Vastus intermedius

Answer 5

O: anterior and lateral surfaces of femur
I: patella through patellar ligament to tibial tuberosity
A: extend leg
Inn: femoral (L2-4)

Question 6

Articularis genus

Answer 6

O: distal part of anterior surface of femur
I: synovial membrane of knee joint
A: pulls synovial membrane of knee proximally during extension of leg
Inn: femoral N (L3-4)

Question 7

Psoas major

Answer 7

O: bodies and TPs of all lumbar vertebrae
I: lesser trochanter of femur
A: flex thigh, slight adduct thigh of free limb
Inn: anterior rami L2-4

Question 8

Iliacus

Answer 8

O: iliac fossa
I: lesser trochanter of femur
A: flex thigh, slight adduct thigh of free limb
Inn: femoral N (L2-4)

Question 9

Psoas minor

Answer 9

O: T12-L1 vertebrae
I: lesser trochanter of femur
A: upward rotation of pelvis
Inn: L1 or L2 or both

Question 10

Pectineus

Answer 10

O: superior ramus of pubis
I: femur just distal to lesser trochanter
A: flex thigh, adduct thigh
Inn: femoral N (possibly obturator or accessory obturator) (L2-3)