Knee

Question 1

Rectus Femoris

Answer 1

Function: hip flexion, knee extension

Innervation: femoral nerve (L2, L3, L4)

Origin: anterior inferior Iliac spine of the ilium

Insertion: quadriceps femoris tendon

Question 2

Vastus Medialis

Answer 2

Function: extends the leg at the knee joint

Innervation: femoral nerve (L2, L3)

Origin: femur - intertrochanteric line, pectineal line, medial lip of the linea aspera, medial supracondylar line

Insertion: quadriceps femoris tendon and medial border of patella

Question 3

Vastus Lateralis

Answer 3

Function: extends the leg at the knee joint

Innervation: femoral nerve (L2, L3, L4)

Origin: femur - intertrochanteric line, greater trochanter, gluteal tuberosity, linea aspera

Insertion: quadriceps femoris tendon and lateral margin of patella

Question 4

Vastus Intermedius

Answer 4

Function: extends the leg at the knee joint

Innervation: femoral nerve (L2, L3, L4)

Origin: femur - anterior and lateral surfaces

Insertion: quadriceps femoris tendon and lateral margin of patella

Question 5

Articularis Genu

Answer 5

Function: pulls the bursa/capsule away from the knee joint during extension

Innervation: femoral nerve (L3, L4)

Origin: femur - just inferior to the origin of the vastus intermedius

Insertion: suprapatellar bursa associated with the knee joint

Question 6

Biceps Femoris

Answer 6

Function: knee flexion, hip extension, and lateral rotation of hip and leg

Innervation: sciatic nerve (L5, S1, S2)

Origin: long head - ischial tuberosity; short head - linea aspera

Insertion: head of fibula

Question 7

Semimembranosus

Answer 7

Function: knee flexion, hip extension, medial rotation of hip and leg

Innervation: sciatic nerve (L5, S1, S2)

Origin: ischial tuberosity

Insertion: medial tibial condyle

Question 8

Semitendinosus

Answer 8

Function: knee flexion, hip extension, medial rotation of hip and leg

Innervation: sciatic nerve (L5, S1, S2)

Origin: ischial tuberosity

Insertion: medial surface of proximal tibia (pes anserine)

Question 9

Popliteus

Answer 9

Function: stabilizes knee joint, unlocks knee joint (laterally rotates femur on fixed tibia)

Innervation: tibial nerve (L4-S1)

Origin: lateral femoral condyle

Insertion: posterior surface of proximal tibia