Knee Flexors and extensors

Question 1

Origin of biceps femoris (long head)

Answer 1

Ischial tuberosity of the pelvis

Question 2

Insertion of biceps femoris (long head)

Answer 2

Head of the fibula

Lateral collateral ligament (LCL) and lateral consuls of tibia

Question 3

Isolated fcn of biceps femoris (long head)

Answer 3

Concentrically accelerates knee flexing and hip extension

Tibial external rotation

Question 4

Integrated fcn of biceps femoris ( long head)

Answer 4

Eccentrically decelerates knee extension, hip flex ion, tibial internal rotation( at mid stance of gait cycle) and stabilized LPHC

Question 5

Origin of biceps femoris ( short head)

Answer 5

Lower one third of the posterior aspect of the femur

Question 6

Insertion of biceps femoris (short head)

Answer 6

Head of fibula

Question 7

Isolated fcn biceps femoris (short head)

Answer 7

Concentrically accelerates knee flexion and tibial external rotation

Question 8

Integrated fcn of biceps femoris (short head)

Answer 8

Eccentrically decelerates knee extension, tibial internal rotation and isometrically stabilizes the knee

Question 9

Origin semimbranosus

Answer 9

Ischial tuberosity of the pelcis

Question 10

Insertion Semimembranosus

Answer 10

Posterior aspect of the medial tibial condyle of the tibia

Question 11

Isolated function of semimebranosus

Answer 11

Concentrically accelerates knee flexion, hip extension, and tibial internal rotation

Question 12

Integrated function of semimebranosus

Answer 12

Eccentrically decelerates knee extension, hip flexion, to be a external rotation, and isometrically stabilizes the knee and LPHC

Question 13

Origin of the semitendinosis

Answer 13

Ischial tuberosity of the pelvis and part of the sacrotuberous ligament

Question 14

Insertion of semitendinosis

Answer 14

Proximal aspect of the medial tibial condyle of the tibia

Question 15

Isolated function of semitendinosis

Answer 15

Concentrically accelerates knee flexion, hip extension, and tibial internal rotation

Question 16

Integrated function of semitendinosis

Answer 16

Eccentrically decelerates knee extension, hip flexion, tibial external rotation, and isometrically stabilizes the knee and LPHC

Question 17

Origin of Vastus lateralis

Answer 17

Greater trochanter and Linnea aspera of the femur, lateral region of the gluteal tuberosity

Question 18

Insertion Vastus lateralis

Answer 18

Base of patella and tibial tuberosity of the tibia

Question 19

Isolated function Vastus lateralis

Answer 19

Concentrically accelerates knee extension

Question 20

Integrated function of Vastus lateralis

Answer 20

Eccentrically decelerates knee flexion, adduction and internal rotation. Isometrically stabilizes the knee

Question 21

Origin of Vastus medialis

Answer 21

Lower region of intertrochanteric line, medial lip of lines aspera, proximal medial supracondylar line of the femur

Question 22

Insertion of vastus medialis

Answer 22

Base of the patella and tibial tuberosity of the tibia

Question 23

Isolated function of vastus medialis

Answer 23

Concentrically accelerates knee extension

Question 24

Integrated function of vastus medialis

Answer 24

Eccentrically decelerates need flexion, adduction and internal rotation. Isometrically stabilizes the knee

Question 25

Origin of Vastus intermedius

Answer 25

Anterior lateral regions of the upper two thirds of the femur

Question 26

Insertion of Vastus intermedius

Answer 26

Of the patella and tibial tuberosity of the tibia

Question 27

Isolated function of Vastus intermedius

Answer 27

Concentrically accelerates knee extension

Question 28

Integrated function of Vastus intermedius

Answer 28

Eccentrically decelerates knee flexion, adduction and internal rotation.Isometric ally stabilize the knee

Question 29

Origin of rectus femoris

Answer 29

Anterior inferior iliac spine of the pelvis

Question 30

Insertion of rectus femoris

Answer 30

Base of the patella and tibial tuberosity of the tibia

Question 31

Isolated function of rectus femoris

Answer 31

Concentrically accelerates knee extension and hip flexion

Question 32

Integrated function of rectus femoris

Answer 32

Eccentrically decelerates knee flexion, adduction and internal rotation. Decelerates hip extension. Isometrically stabilizes the knee and LPHC

Question 33

What are the knee flexors?

Answer 33

Hamstrings: biceps femoris ( long head), biceps femoris (short head), semimebranosus, semitendinosis

Question 34

What are the knee extensors?

Answer 34

Quadriceps: Vastus lateralis, Vastus medialis, Vastus intermedius, and rectus femoris