Posterior Thigh Muscles

Question 1

Semitendinosus - Origin

Answer 1

Ischial tuberosity

Question 2

Biceps Femoris (long head) - Action

Answer 2

• extends thigh

- flexes leg and rotates it laterally when knee is flexed

Question 3

Semitendinosus - Action

Answer 3

• extend thigh
• flex leg and rotate it medially when knee is flexed
• can extend trunk when thigh and leg are flexed

Question 4

Semimembranosus - Innervation

Answer 4

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

Question 5

Biceps Femoris (short head) - Action

Answer 5

• extends thigh

- flexes leg and rotates it laterally when knee is flexed

Question 6

Semimembranosus - Actions

Answer 6

• extend thigh
• flex leg and rotate it medially when knee is flexed
• can extend trunk when thigh and leg are flexed

Question 7

Semimembranosus - Insertion

Answer 7

• posterior part of medial condyle of tibia

- reflected attachment forms oblique popliteal ligament (to lateral femoral condyle)

Question 8

Semitendinosus - Innervation

Answer 8

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

Question 9

Biceps Femoris (long head) - Insertion

Answer 9

Lateral side of head of fibula

Question 11

Semimembranosus - Origin

Answer 11

Ischial tuberosity

Question 13

Biceps Femoris (long head) - Innervation

Answer 13

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

Question 16

Biceps Femoris (Long Head) - Origin

Answer 16

Ischial tuberosity

Question 17

Semitendinosus - Insertion

Answer 17

Medial surface of superior part of tibia

Question 18

Biceps Femoris (short head) - Origin

Answer 18

• Linea aspera

- lateral supracondylar line of femur

Question 19

Biceps Femoris (short head) - Insertion

Answer 19

• lateral side of head of fibula

- tendon is split at this site by fibular collateral ligament of knee

Question 20

Biceps Femoris (short head) - Innervation

Answer 20

Common fibular division of sciatic nerve (L5, S1, S2)