Posterior and Anterior Thigh

Question 1

What is the proximal attachment of the semitendinosus and semimembranosus?

Answer 1

Ischial tuberosity

Question 2

What is the distal attachment of the semitendinosus?

Answer 2

Medial surface of superior part of tibia

Question 3

What nerve innervates the semitendinosus and semimembranosus?

Answer 3

Tibial division of sciatic nerve (L5,S1,S2)

Question 4

What is the main action of the semitendonosus and semimembranosus?

Answer 4

• Extends thigh
• flex leg and rotate it medially when leg is flexed
• When thigh and leg are flexed these muscles can extend trunk

Question 5

What is the distal attachment of the semimembranosus?

Answer 5

Medial condyle of tibia

Question 6

What is the proximal attachment of the biceps femoris?

Answer 6

Long head: ischial tuberosity

Short head: linea aspera and lateral supracondylar line of femur

Question 7

What is the distal attachment of the biceps femoris?

Answer 7

Head of fibula; tendon is split at this sight by fibular collateral ligament of knee

Question 8

What nerve innervates the biceps femoris?

Answer 8

Long head: tibial division of sciatic nerve (L5,S1,S2)

Short head: common fibular division of sciatic nerve (L5,S1,S2)

Question 9

What is the muscle action of the biceps femoris?

Answer 9

• Flexes leg and rotates is laterally when knee is flexed

- Extends thigh

Question 10

What is the proximal attachment of the pectineus?

Answer 10

Superior ramus of the pubis

Question 11

What is the distal attachment of the pectineus?

Answer 11

Pectineal line inferior to lesser trochanter

Question 12

What nerve innervates the pectineus?

Answer 12

Femoral nerve (L2,L3) 
May receive branches from oburator nerve

Question 13

What is the main action of the pectineus?

Answer 13

• Adducts and flexes thigh

- Assists in medial rotation of thigh

Question 14

What is the proximal attachment of the psoas major?

Answer 14

Sides of T12-L5 vertebrae

Question 15

What is the distal attachment of the psoas major?

Answer 15

Lesser trochanter of femur

Question 16

What nerve innervates the psoas major?

Answer 16

Anterior rami of lumbar nerves (L1, L2)

Question 17

What is the main action of the psoas major, psoas minor, and illiacus?

Answer 17

• Flex thigh at hip joint

- stabilizes hip joint

Question 18

What is the proximal attachment of the psoas minor?

Answer 18

Sides of T12-L1 vertebrae and intervertebral discs

Question 19

What is the distal attachment of the psoas minor?

Answer 19

Pectineal line, iliopectineal eminence via iliopectineal arch

Question 20

What nerve innervates the psoas minor?

Answer 20

Anterior rami of lumbar nerve (L1, L2)

Question 21

What is the proximal attachment of the iliacus?

Answer 21

• Iliac crest and fossa
• ala of sacrum
• Anterior sacro-iliac ligaments

Question 22

What is the distal attachment of the iliacus?

Answer 22

• Tendon of psoas major

- Lesser trochanter of femur and below it

Question 23

What nerve innervates the iliacus?

Answer 23

Femoral nerve (L2, L3)

Question 24

What is the proximal attachment of the sartorius?

Answer 24

Anterior superior iliac spine

Question 25

What is the distal attachment of the sartorius?

Answer 25

Medial surface of tibia?

Question 26

What nerve the sartorius?

Answer 26

Femoral nerve (L2, L3)

Question 27

What is the main action of the sartorius?

Answer 27

- Flexes, abducts, and laterally rotates thigh at hip joint | - Flexes leg at knee joint

Question 28

What id the proximal attachment of the rectus femoris?

Answer 28

Anterior inferior iliac spine

Question 29

What is the distal attachment of the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius?

Answer 29

Quadriceps tendon and patellar tendon

Question 30

What nerve innervates the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius?

Answer 30

Femoral nerve (L2, L3, L4)

Question 31

What is the main action of the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius?

Answer 31

- Extend leg at knee joint | - Steadies hip joint

Question 32

What is the proximal attachment of the vastus lateralis?

Answer 32

- Greater trochanter | - Linea aspera of femur

Question 33

What is the proximal attachment of the vastus medialis?

Answer 33

- Intertrochanteric line | - Linea aspera of femur

Question 34

What is the proximal attachment of the vastus intermedius?

Answer 34

Shaft of femur