Knee Muscles

Question 1

Popliteus

Answer 1

Origin: Lateral surface of lateral condyle of femur
Insertion: Posterior surface of upper tibia
Function: internal rotation of leg/knee, flexion of leg and knee

Question 2

Vastus Intermedius (quad)

Answer 2

Origin: Deep, anterior shaft of femur
Insertion: Patella
Function: Extend the knee

Question 3

Vastus Medialis (quad)

Answer 3

Origin: Medial aspect of femur
Insertion: patella
Function: Extend the knee

Question 4

Vastus lateralis (quad)

Answer 4

Origin: lateral aspect of femur
Insertion: patella
Function: extend the knee

Question 5

Rectus femoris (quad)

Answer 5

Origin: anterior inferior iliac spine
Insertion: patellar tendon
function: extend knee, also hip flexor

Question 6

gastrocnemius

Answer 6

Origin: condyle of femur
Insertion: Achilles
Function: knee flexion

Question 7

Gracilis

Answer 7

Origin: Pubis
Insertion: below medial condyle of tibia -Pes anserinus
function: weak knee flexor, adductor

Question 8

Semimembranosus (HS)

Answer 8

Origin: Ischial tuberosity
insertion: posterior medial condyle of tibia
function knee flexor, hip extender, medial rotate knee

Question 9

Semitendonosus (HS)

Answer 9

Origin: ischial Tuberosity
Insertion: medial tibia - Pes anserinus
Function: hip extender, internal knee rotator

Question 10

Bicept Femoris LH (HS)

Answer 10

Origin: Ischial Tuberosity
Insertion: fibula (styloid process)
Function: Hip extensor

Question 11

Bicept Femoris SH (HS-ish)

Answer 11

Origin: back of femur (lateral to supracondylar ridge) - linerar aspera
Insertion: fibula (styloid process)
Function: flex knee

Question 12

Sartorius

Answer 12

Origin: anterior superior iliac spine (ASIS)
Insertion: upper medial portion of tibia
Action: rotate hip, hip flexor, hip abduct, weak knee flexor