Knee Muscles

Question 0

Vastus lateralis

Answer 0

O: greater trochanter, lateral lip of linea aspera, lateral intermuscular septum
I: tibial tuberosity via patellar ligament
A: knee extension
In: femoral nerve L2-4
Art: branches form the profunda femoris artery

Question 1

Rectus femoris

Answer 1

O: AIIS
I: tibial tuberosity via patellar ligament
A: knee extension; NWB: hip flexion; WB: controls hip extension
In: femoral nerve L2-4
Art: femoral artery and branches from the profunda femoris artery

Question 2

Vastus medialis

Answer 2

O: intertrochanteric line of femur and medial linea aspera
I: tibial tuberosity via patellar ligament
A: knee extension
In: femoral nerve L2-4
Art: femoral artery and branches from the profunda femoris artery

Question 3

Vastus intermedius

Answer 3

O: anterior lateral femur
I: tibial tuberosity via patellar ligament
A: knee extension
In: femoral nerve L2-4
Art: femoral artery and branches from the profunda femoris artery

Question 4

Semimembranosus

Answer 4

O: ischial tuberosity
I: medial condyle of tibia
A: knee flexion, medial rotation; NWB: hip extension; WB: controls hip flexion
In: tibial nerve L5-S2
Art: branches from the internal iliac, popliteal, and profunda femoris arteries

Question 5

Semitendinosus

Answer 5

O: ischial tuberosity
I: upper part medial surface of tibia
A: knee flexion, medial rotation; NWB: hip extension; WB: controls hip flexion
In: tibial nerve L5-S2
Art: branches from the internal iliac, popliteal and profunda femoris arteries

Question 6

Biceps femoris- long head

Answer 6

O: ischial tuberosity
I: lateral condyle of tibia and head of fibula
A: knee flexion, lateral rotation; NWB: hip extension, helps with external rotation; WB: controls hip flexion
In: sciatic nerve L5-S2
Art: branches from the internal iliac, popliteal and profunda femoris arteries

Question 7

Biceps femoris- short head

Answer 7

O: linea aspera
I: lateral condyle of tibia and head of fibula
A: knee flexion, lateral rotation
In: common perineal nerve L5-S1
Art: branches from the internal iliac, popliteal and profunda femoris arteries

Question 8

Sartorius

Answer 8

O: ASIS
I: upper part medial surface of tibia
A: knee flexion, lateral rotation; NWB: hip flexion, abduction, external rotation; WB: controls hip extension, adduction, internal rotation
In: femoral nerve L2-3
Art: branches from femoral artery

Question 9

Popliteus

Answer 9

O: lateral femoral condyle 
I: posterior tibia above soleal line
A: knee flexion, medial rotation 
In: tibial nerve L5-S1
Art: popliteal artery

Question 10

Gastrocnemius

Answer 10

O: medial epicondyle of femur; lateral epicondyle of femur
I: calcaneus via calcaneus (Achilles tendon)
A: NWB: ankle plantar flexion and knee flexion; WB: deceleration of internal rotation of lower limb, helps decelerate pronation, ankle plantar flexion during push-off
In: tibial nerve S1-2
Art: branches from the posterior tibial artery and popliteal artery

Question 11

Plantaris

Answer 11

O: above lateral head of gastrocnemius on femur
I: calcaneus via calcaneal (Achilles) tendon
A: very weak knee flexor; NWB: weak ankle plantar flexion; WB: weak control of dorsiflexion
In: tibial nerve S1-2
Art: popliteal artery