5. Thigh Muscles

Question 1

Biceps Femoris origin and insertion

Answer 1

origin
long head: upper ischial tuberosity
short head: lateral edge of linea aspera

insertion
- head of fibula

Question 2

Biceps Femoris innervation

Answer 2

sciatic nerve (mainly from S1)

Question 3

Biceps Femoris Action

Answer 3

knee flexion 
hip extension (long head only)

Question 4

Semitendinosus origin and insertion

Answer 4

origin
- upper ischial tuberosity

insertion
- medial surface of proximal tibia

Question 5

Semitendinosus innervation

Answer 5

sciatic nerve (mainly from S1)

Question 6

Semitendinosus action

Answer 6

knee flexion and internal rotation

hip extension and internal rotation

Question 7

Semimembranosus origin and insertion

Answer 7

origin
- ischial tuberosity

insertion
- medial and posterior medial condyle of tibia

Question 8

Semimembranosus action

Answer 8

knee flexion and internal rotation

hip extension and internal rotation

Question 9

Semimembranosus innervation

Answer 9

sciatic nerver (mainly from S1)

Question 10

Tensor Fascia Latae origina and insertion

Answer 10

origin
- lateral edge of iliac crest (b/w ASIS and iliac tuberosity)

insertion
- iliotibial band

Question 11

Tensor Fascia Latae action

Answer 11

knee and hip stability

- tightens the IT band

Question 12

Sartorius origin and insertion

Answer 12

origin
- ASIS

insertion
- medial surface or tibia just below tibial tuberosity

Question 13

Sartorius action

Answer 13

knee flexion

hip flexion

Question 14

Sartorius innervation

Answer 14

femoral nerve

Question 15

Rectus Femoris origin and insertion

Answer 15

Origin

ant. head: AIIS
post. head: ilium superior to acetabulum

Insertion
- quadriceps tendon

Question 16

Rectus Femoris action

Answer 16

flexion hip (only quad muscle that does this)
extension knee

Question 17

Innervation of all anterior thigh muscles (quads and sartorius)

Answer 17

femoral nerve

Question 18

Tensor Fascia Latae innervation

Answer 18

superior gluteal nerve

Question 19

Insertion of all quadriceps muscles

Answer 19

quadriceps tendon

Question 20

Quadricep muscles

Answer 20

Rectus femoris

Vastus intermedius, lateralis and medialis

Question 21

Hamstring muscles

Answer 21

Biceps femoris (most lateral)
Semitendinosus (medial and superficial)
Semimembranosus (medial and deep)

Question 22

Vastus Intermedius origin

Answer 22

femur - upper 2/3 of anterior and lateral surfaces

Question 23

Vastus Intermedius, Medius and Lateralis action

Answer 23

knee extension

Question 24

Vastus Lateralis origin

Answer 24

Femur

• intertrochanteric line
• greater trochanter
• gluteal tuberosity
• lateral linea aspera

Question 25

Vastus Medialus origin

Answer 25

Femur - intertrochanteric line - pectineal line - medial linea aspera - medial supracondylar line