Potserior thigh muscles

Question 1

Semitendinosus (MEDIAL)

Answer 1

• Origin: lower media facet of lateral section of the ischial tuberosity
• Insertion: medial surface of medial condyle of tibia
  Movements
• hip extensor
• flexion of knee
• if knee is semiflexed = medial rotation of knee
• if fixed foot, lateral rotator of the femur + pelvis on tibia

Question 2

Semimembranosus (MEDIAL)

Answer 2

• Origin: upper lateral facet of ischial tuberosity
• Insertion: horizontal groove, on the posteromedial surface of the medial tibial condyle
  Movements
• hip extensor
• flexion of knee
• if knee is semiflexed = medial rotation of knee
• if fixed foot, lateral rotator of the femur + pelvis on tibia

Question 3

Long head of biceps femoris (LATERAL)

Answer 3

• Origin: (inferomedial impression of) ischial tuberosity, sacrotuberous ligament
• Insertion: (Lateral aspect of) head of fibula
  Movements
• extend hip joint
• flexing knee joint
• knee semiflexed, rotates leg laterally on the thigh

Question 4

Short head of biceps femoris (LATERAL)

Answer 4

• Origin: linea aspera of femur (lateral lip), lateral supracondylar line of femur
• Insertion: (Lateral aspect of) head of fibula (LYING SUPERFICIALLY TO IT)
  Movements
• flexing knee joint
• knee semiflexed, rotates leg laterally on the thigh