Muscles of Posterior Thigh

Question 1

Semitendinosus

Answer 1

O: Ischial Tuberosity
I: Medial Surface of Superior part of Tibia
N: Tibial division of Sciatic Nerve (L5, S1, S2)
A: Extend thigh, Flex Leg and rotate it Medially when knee is flexed, when thigh and leg are flexed these muscles can extend trunk

Question 2

Semimembranosus

Answer 2

O: Ischial Tuberosity
I: Posterior part of Medial Condyle of Tibia, reflected attachment forms oblique popliteal ligament
N: Tibial division of Sciatic Nerve (L5, S1, S2)
A: Extend Thigh, Flex Leg and Rotate it Medially when knee is flexed when thigh and leg are flexed these muscles can extend trunk

Question 3

Biceps Femoris (long head)

Answer 3

O: Ischial Tuberosity
I: Lateral Side of Head of Fibula Tendon is split at this site by Fibular Collateral Ligament of knee
N: Tibial Division of Sciatic Nerve (L5, S1, S2)
A: Flexes Leg and rotates it Laterally when knee is flexed extends thigh

Question 4

Biceps Femoris (Short Head)

Answer 4

O: Linea Aspera and Lateral supracondylar line of femur
I: Lateral Side of Head of Fibula Tendon is split at this site by Fibular Collateral Ligament of knee
N: Common Fibular Division of Sciatic Nerve (L5, S1, S2)
A: Flexes Leg and rotates it Laterally when knee is flexed extends thigh