Knee Muscle Actions, Origins and Insertions (week 5)

Question 1

state the action(s) of the - rectus femoris

Answer 1

knee extension, hip flexion

Question 2

state the action(s) of the - vastas intermedius, vastas medals, vastas lateralis

Answer 2

knee extension

Question 3

state the action(s) of the - bicep femoris

Answer 3

hip extension (LH), knee flexion (SH)

Question 4

state the action(s) of the - semi membranosus and semi tendinous

Answer 4

knee flexion, hip extension, knee medial rotation (when the knee is flexed)

Question 5

state the action(s) of the - popliteus

Answer 5

knee flexion, knee medial rotation whilst it’s flexing

Question 6

state the action(s) of the - gastrocnemius

Answer 6

knee flexion, ankle planter flexion

Question 7

state the action(s) of the - plantaris

Answer 7

knee flexion, ankle planter flexion

Question 8

state the origin(s) of the - rectus femoris

Answer 8

anterior inferior iliac spine, ilium (above the acetabulum)

Question 9

state the origin(s) of the - vastas intermedius

Answer 9

upper 3rd anterior surface of femur, linea aspera

Question 10

state the origin(s) of the - vastas medialis

Answer 10

medial lip of linea aspera

Question 11

state the origin(s) of the - vastas lateralis

Answer 11

lateral lip of linea aspera

Question 12

state the origin(s) of the - bicep femoris

Answer 12

ischial tuberosity (LH), linea aspera of femur (SH)

Question 13

state the origin(s) of the - semi membranosus and the semi tendinous

Answer 13

ischial tuberosity

Question 14

state the origin(s) of the - popliteus

Answer 14

posterior surface of the lateral condyle of the femur

Question 15

state the origin(s) of the - gastrocnemius

Answer 15

posterior surface of the lateral condyle of the femur

Question 16

state the origin(s) of the - plantaris

Answer 16

lateral supracondylar ridge of the femur

Question 17

state the insertion(s) of the - rectus femoris, vastas lateralis, vastas intermedius, and the vastus medialis

Answer 17

tibial tuberosity via the patella tendon

Question 18

state the insertion(s) of the - bicep femoris

Answer 18

lateral head of fibula and lateral condyle of tibia

Question 19

state the insertion(s) of the - semi membranosus

Answer 19

medial condyle of tibia

Question 20

state the insertion(s) of the - semi tendinous

Answer 20

medial shaft of tibia via pes ansurinus

Question 21

state the insertion(s) of the - gastrocnemius

Answer 21

posterior surface of calcaneus via Achilles tendon

Question 22

state the insertion(s) of the - plantaris

Answer 22

posterior surface of calcaneus

Question 23

state a fact about the plantaris tendon

Answer 23

The plantaris tendon fuses with the medial side of the Achilles tendon proximal to its attachment site