Quadriceps

Question 1

Rectus Femoris

Answer 1

Origin: Anterior inferior iliac spine and ilium superior to acetabular

Insertion: Base of patella and by patellar ligament to tibial tuberosity

Actions: Extends leg at knee joint, rectus femoris also steadies the hip joint and helps the iliopsoas flex the thigh at the hip joint

Question 2

Vastus Lateralis

Answer 2

Origin: Greater trochanter and lateral lip of lines aspera of femur and gluteal tuberosity

Insertion: Base of patella and by patellar ligament to tibial tuberosity

Action: Extends leg at knee joint

Question 3

Vastus Medialis

Answer 3

Origin: Intertrochanteric line and medial lip of linea aspera of femur and gluteal tuberosity

Insertion: Base of patella and by patellar ligament to tibial tuberosity

Action: Extends leg at knee joint

Question 4

Vastus Intermedius

Answer 4

Origin: Anterior and lateral surfaces of femoral shaft

Insertion: Base of patella and by the patellar ligament to the tibial tuberosity

Action: Extends the leg at the knee joint

Question 5

Tensor Fasciae Latae

Answer 5

Not a quad, but an anterior thigh muscle

Origin: Anterior superior iliac spine and anterior iliac crest

Insertion: Iliotibial tract that attaches to the lateral condyle of tibia

Actions: Abducts, medially rotates, and flexes the thigh at the hip; helps keep the knee extended