Muscles of the Knee

Question 1

Rectus Femoris

Answer 1

PM hip flexion and knee extension, assist hip abduction, is the only biarticulate quad muscle

Question 2

Vastus Lateralis

Answer 2

PM knee extension

Question 3

Vastus Medialis

Answer 3

PM knee extension, most active in last 30 degrees of extension

Question 4

Vastus Intermedius

Answer 4

PM knee extension

Question 5

Semimembranosus

Answer 5

PM knee flexion and internal rotation of tibia, also PM hip extension and assist external rotation

Question 6

Semitendinosus

Answer 6

PM knee flexion and internal rotation of tibia, also PM hip extension and assist external rotation

Question 7

Biceps Femoris

Answer 7

PM knee flexion and external rotation of tibia, also PM hip extension and assist external rotation

Question 8

Popliteus

Answer 8

PM internal rotation of tibia assist flexion

Question 9

How does patella increase mechanical advantage of quadricep muscle

Answer 9

Increases the moment arm length

Question 10

What are the four quad muscles

Answer 10

Rectus femoris, vastus lateralis, vastus medialis, vastus intermedius