Quadriceps

Question 1

Vastus lateralis (quads)

Outer (lateral) quad muscle

Answer 1

Integrated function:
Eccentrically decelerates knee flexion, adduction, and internal rotation
Isometrically stabilizes the knee

Question 2

Vastus medialis (quads)

Inside quad muscle

Answer 2

Integrated function:
Eccentrically decelerates knee flexion, adduction, and internal rotation
Isometrically stabilizes the knee

Question 3

Vastus intermedialis (quads)

Middle interior quad

Answer 3

Integrated function:
Eccentrically decelerates knee flexion, adduction, and internal rotation
Isometrically stabilizes the knee

Question 4

Rectus femorus (quad)

Over the femur

Answer 4

Integrated function:
Eccentrically decelerates knee flexion, adduction, and internal rotation
Decelerates hip extension
Isometrically stabilizes the lumbo-pelvic-hip complex and knee