Thigh muscles

Question 1

Sartorius origin

Answer 1

ASIS

Question 2

Sartorius insertion

Answer 2

Upper medial tibia (per anserinus)

Question 3

Sartorius action

Answer 3

Flex, ER, and abduct (weak) thigh; flex and internally rotate leg

Question 4

Sartorius innervation and spinal level

Answer 4

Femoral L2-3

Question 5

Rectus femoris origin

Answer 5

AIIS and superior rim of acetabulum

Question 6

Rectus Femoris insertion

Answer 6

Patella, then into tibial tuberosity

Question 7

Rectus femoris action

Answer 7

Flex the thigh; extend the leg

Question 8

Rectus Femoris innervation and spinal level

Answer 8

Femoral L2-4

Question 9

Vastus Lateralis origin

Answer 9

Greater trochanter (lateral surface) and lateral lip of linea aspera

Question 10

Vastus lateralis insertion

Answer 10

Patella, then into tibial tuberosity

Question 11

Vastus lateralis action

Answer 11

Extend the leg

Question 12

Vastus lateralis innervation and spinal level

Answer 12

Femoral L2-4

Question 13

Vastus intermedius origin

Answer 13

Anterior surface of the femur

Question 14

Vastus intermedius insertion

Answer 14

Patella, then into tibial tuberosity

Question 15

Vastus intermedius action

Answer 15

Extend the leg

Question 16

Vastus intermedius innervation and spinal level

Answer 16

Femoral L2-4

Question 17

Vastus medialis origin

Answer 17

Medial lip of the linea aspera, intertrochanteric line

Question 18

Vastus medialis insertion

Answer 18

Patella, then into tibial tuberosity

Question 19

Vastus medialis action

Answer 19

Extend the leg

Question 20

Vastus Medialis innervation and spinal level

Answer 20

Femoral L2-4

Question 21

Tensor vastus intermedius origin

Answer 21

Continuous with VI and VL, very proximal anterior femur

Question 22

Tensor vastus intermedius insertion

Answer 22

Aponeurosis of vastus intermedius, then into tibial tuberosity via patella

Question 23

Tensor vastus intermedius action

Answer 23

Tenses aponeurosis

Question 24

Tensor Vastus Intermedius innervation and spinal level

Answer 24

Femoral L2-4

Question 25

Biceps femoris origin

Answer 25

Long head: ischial tuberosity & sacrotuberous ligament | Short head: middle 1/3 lateral lip of linea aspera, lateral intermuscular septum

Question 26

Biceps femoris insertion

Answer 26

Head of fibula

Question 27

Biceps femoris action

Answer 27

Extend; externally rotate the thigh (long head only) ; flex and externally rotate the leg (both heads)

Question 28

Biceps femoris innervation and spinal level

Answer 28

Sciatic L5-S2 Long head =tibial Short head= common fibular

Question 29

Semitendinosus origin

Answer 29

Ischial tuberosity and sacrotuberous ligament

Question 30

Semitendinosus insertion

Answer 30

Upper medial surface of the tibia (pes anserinus) and fascia of the leg

Question 31

Semitendinosus action

Answer 31

Extend the thigh; flex and internal rotate leg (may assist IR of the thigh)

Question 32

Semitendinosus innervation and spinal level

Answer 32

Sciatic (tibial) L5-S2

Question 33

Semimembranosus origin

Answer 33

Ischial tuberosity

Question 34

Semimembranosus insertion

Answer 34

Posteromedial side of the medial tibial condyle, fascia, oblique popliteal lig

Question 35

Semimembranosus action

Answer 35

Extend the thigh; flex and internally rotate leg (may assist IR of the thigh)

Question 36

Semimembranosus innervation and spinal level

Answer 36

Sciatic (tibial) L5-S2

Question 37

Pectineus origin

Answer 37

Superior pubic ramus

Question 38

Pectineus insertion

Answer 38

Just inferior to lesser trochanter (pectineal line and proximal linea aspera)

Question 39

Pectineus action

Answer 39

Adduct; flex; depending on amount of anteversion or retroversion, may IR (more anteverted) or ER (more retroverted)

Question 40

Pectineus innervation and spinal level

Answer 40

Femoral L2-3

Question 41

Adductor longus origin

Answer 41

Anteromedial aspect of the pubis (superior pubic ramus) and anterior symphysis

Question 42

Adductor longus insertion

Answer 42

Middle 1/3 of the medial lip of the linea aspera

Question 43

Adductor longus action

Answer 43

Adduct, assist flexion, possible assist internal rotation of the thigh (external rotates thigh at more than 80 flexion)

Question 44

Adductor longus innervation and spinal level

Answer 44

Obturator L2-4

Question 45

Adductor brevis origin

Answer 45

Outer surface of the inferior pubic ramus

Question 46

Adductor brevis insertion

Answer 46

Middle 1/3 of the medial lip of the linea

Question 47

Adductor brevis action

Answer 47

Adduct, assist flexion, possible assist internal rotation of the thigh (externally rotates thigh at more than 80 flexion)

Question 48

Adductor brevis innervation and spinal level

Answer 48

Obturator L2-3

Question 49

Gracilis origin

Answer 49

Inferior pubic ramus

Question 50

Gracilis insertion

Answer 50

Upper medial aspect of the tibia (pes anserinus)

Question 51

Gracilis action

Answer 51

Adduct, flex thigh; assist leg flexion, and internally rotate flexed leg

Question 52

Gracilis innervation and spinal level

Answer 52

Obturator L2-3

Question 53

Adductor magnus origin

Answer 53

Inferior pubic ramus, ischial ramus and tuberosity

Question 54

Adductor magnus insertion

Answer 54

Adductor portion= linea aspera (medial lip) | Hamstring portion= adductor tubercle

Question 55

Adductor magnus action

Answer 55

Adduct, assist internal rotation of the thigh; adductor portion assist thigh flexion, hamstring portion assist thigh extension

Question 56

Adductor magnus innervation and spinal level

Answer 56

``` Adductor= obturator L2-4 Hamstring= sciatic (tibial) L4 ```