PT 661 Knee Muscles

Question 1

Rectus femoris m.

Answer 1

AIIS (Anterior inferior iliac spine), ilium superior to acetabulum
Tibial tuberosity (via patellar ligament)
Femoral nerve
L3, L4
Extends leg and flexes thigh

Question 2

Vastus lateralis m.

Answer 2

Greater trochanter, gluteal tuberosity, lateral lip of linea aspera
Tibial tuberosity (via patellar ligament)
Femoral nerve
L3, L4
Extends leg

Question 3

Vastus medialis m.

Answer 3

Intertrochanteric line, greater trochanter, gluteal tuberosity, medial lip of linea aspera
Tibial tuberosity (via patellar ligament)
Femoral nerve
L3, L4
no action

Question 4

Vastus intermedius m.

Answer 4

Anterior and lateral surfaces of body of femur
Tibial tuberosity (via patellar ligament)
Femoral nerve
L3, L4
Extends leg

Question 5

Semimembranosus m.

Answer 5

Ischial tuberosity
Posterior part of medial condyle of tibia
Sciatic nerve (tibial division)
L5, S1
Flexes leg, extends thigh

Question 6

Semitendinosus m.

Answer 6

Ischial tuberosity
Superior part of medial surface of tibia
Sciatic nerve (tibial division)
L5, S1
Flexes leg, extends thigh

Question 7

Biceps femoris m.

Answer 7

“Long head:ischial tuberosity
Short head:linea aspera and lateral supracondylar line of femur”

Lateral surface of head of fibula

“Long head:sciatic nerve (tibial division)
Short head:sciatic nerve (common fibular division)”

S1

Flexes and externally rotates leg, extends thigh

Question 8

Popliteus m.

Answer 8

Lateral surface of lateral condyle of femur, lateral meniscus
Posterior tibia superior to soleal line
Tibial nerve
no myotome
Flexes knee, unlocks knee when extended

Question 9

Gracilis m.

Answer 9

Body and inferior ramus of pubis
Superior part of medial surface of tibia
Obturator nerve
L2
Adducts thigh, flexes and internally rotates leg

Question 10

Satorious m.

Answer 10

ASIS (Anterior superior iliac spine), ilium inferior to that spine
Superior part of medial surface of tibia
Femoral nerve
L3, L4
Abducts, laterally rotates, and flexes thigh; flexes knee