Posterior Thigh

Question 1

Semitendinosus: Proximal Attachment

Answer 1

Ischial tuberosity

Question 2

Semitendinosus: Distal Attachment

Answer 2

Medial surface of superior part of tibia

Question 3

Semitendinosus: Action

Answer 3

• Extend thigh
• Flex leg + rotate it medially when knee is flexed
• Extend trunk when thigh and leg are flexed

Question 4

Semitendinosus: Innervation

Answer 4

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

Question 5

Semimembranosus: Proximal Attachment

Answer 5

Ischial tuberosity

Question 6

Semimembranosus: Distal Attachment

Answer 6

• Posterior part of medial condyle of tibia

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

Question 7

Semimembranosus: Action

Answer 7

• Extend thigh
• Flex leg + rotate it medially when knee is flexed
• Extend trunk when thigh and leg are flexed

Question 8

Semimembranosus: Innervation

Answer 8

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

Question 9

Biceps Femoris: Proximal Attachment

Answer 9

• Long head: ischial tuberosity

- Short head: linea aspera and lateral supracondylar line of femur

Question 10

Biceps Femoris: Distal Attachment

Answer 10

Lateral side of head of fibula

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

Question 11

Biceps Femoris: Action

Answer 11

• Flexes leg
• Rotates it laterally when knee is flexed
• Extends thigh (e.g., accelerating mass during first step of gait)

Question 12

Biceps Femoris: Innervation

Answer 12

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