Hamstring Muscles

Question 1

Biceps Femoris

Answer 1

Action (5)

• flex knee
• extend hip
• tilt pelvis posteriorly
• laterally rotate flexed knee
• laterally rotate hip

Origin
-ischial tuberosity

Insertion
-Head of fibula

Nerve
-sciatic L4,5,S1,2

Question 2

Semitendinosus

Answer 2

Action (5)

• flex knee
• extend hip
• tilt pelvis posteriorly
• medially rotate flexed knee
• medially rotate hip

Origin
-ischial tuberosity

Insertion
-proximal, medial shaft of tibia at pes arsenius tendon

Nerve
-sciatic L4,5,S1,2

Question 3

Semimembranosus

Answer 3

Action (5)
SAME AS SEMITENDINOSUS

Origin
-ischial tuberosity

Insertion
-posterior aspect of medial condyle of tibia

Nerve
-sciatic L4,5,S1,2