Posterior Thigh Muscles

Question 1

Name the Posterior Thigh Muscles

Answer 1

Semitendinosus
Semimebranosus
Biceps Femoris, long and short heads

Question 2

Semitendinosus - Origin

Answer 2

Ishcial tuberosity

Question 3

Semitendinosus - Insertion

Answer 3

Medial surface of superior part of tibia

Question 4

Semitendinosus - Innervation

Answer 4

Tibial division of Sciatic Nerve (L5, S1, S2)

Question 5

Semitendinosus - Action(s)

Answer 5

Extend hip joint
Flex knee joint and rotate the leg medially when knee is flexed
Can extend the trunk

Question 6

Semimebranosus - Origin

Answer 6

Ishcial tuberosity

Question 7

Semimebranosus - Insertion

Answer 7

Posterior part of medial condyle of tibia

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

Question 8

Semimebranosus - Innervation

Answer 8

Tibial division of Sciatic Nerve (L5, S1, S2)

Question 9

Semimebranosus - Action(s)

Answer 9

Extend hip joint
Flex knee joint and rotate the leg medially when knee is flexed
Can extend the trunk

Question 10

Biceps Femoris, long and short head - Origin

Answer 10

Long Head: Ischial tuberosity

Short Head: Linea aspera and lateral supracondylar line of femur

Question 11

Biceps Femoris, long and short head - Insertion

Answer 11

Lateral side of head of fibula

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

Question 12

Biceps Femoris, long and short head - Innervation

Answer 12

Long Head: Tibial division of Sciatic Nerve (L5, S1, S2)

Short Head: Common Fibular division of Sciatic Nerve (L5, S1, S2)

Question 13

Biceps Femoris, long and short head - Action(s)

Answer 13

Flexes knee joint and rotates it laterally when knee is flexed
Extends hip joint (when starting to walk)