Posterior Thigh Muscles

Question 0

Insertion of the semitendinosus

Answer 0

Medial surface of superior part of tibia

Question 1

Origin of the semitendinosus

Answer 1

Ischial tuberosity

Question 2

Innervation of semitendinosus

Answer 2

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

Question 3

Actions of the semitendinosus

Answer 3

Extend thigh
Flex leg and rotate it medially when knee is flexed
When thigh and leg are flexed, can extend trunk

Question 4

Origin of the semimembranosus

Answer 4

Ischial tuberosity

Question 5

Insertion of the semimembranosus

Answer 5

Posterior part of medial condyle of tibia

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

Question 6

Innervation of the semimembranosus

Answer 6

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

Question 7

Actions of the semimembranosus

Answer 7

Extend thigh
Flex leg and rotate it medially when knee is flexed
When thigh and leg are flexed, can extend trunk

Question 8

Origin of the biceps femoris

Answer 8

Long head: ischial tuberosity

Short head: linea aspera and lateral supracondylar line of femur

Question 9

Insertion of the biceps femoris

Answer 9

Lateral side of head of fibula

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

Question 10

Innervation of biceps femoris

Answer 10

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

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

Question 11

Action of the biceps femoris

Answer 11

Flexes leg and rotates it laterally when knee is flexed
Extends thigh (e.g., when starting to walk)