The Knee Muscles

Question 1

What flexes the knee

Answer 1

Semitendonosus, semimembranosus, biceps femoris,

Question 2

What extends the knee

Answer 2

Vastus lateralis, vastus medialis, vastus imtermedius, rectus femoris

Question 3

What assists knee flexion

Answer 3

Gracilis, sartorius, plantaris, popliteus

Question 4

Lateral rotators of the knee

Answer 4

Biceps femoris

Question 5

Medial rotators of the knee

Answer 5

Semitendonosus, semimembranosus, sartorius, popliteus

Question 6

What are the origins, insertions and nerve supply of semitendonosus

Answer 6

Origins: ischial tuberosity
Insertions: medial surface of proximal tibia
Nerve supply: sciatic nerve

Question 7

What are the origins, insertions and nerve supply of biceps femoris

Answer 7

Origins: long head- ischial tuberosity, short head lat lip linea aspera and supracondylar ridge of femur
Insertions: head of fibula and lateral tibia condyle
Nerve supply: sciatic nerve

Question 8

What are the origins, insertions and nerve supply semimembranosus

Answer 8

Origins: ischial tuberosity
Insertions: post surface of medial tibial condyle
Nerve supply: sciatic

Question 9

Origins, insertions and nerve supply of rectus femoris

Answer 9

Origins: long head AIIS, short head: ilium above acetabulum
Insertions: quadriceps tendon
Nerve supply: femoral nerve

Question 10

Origins, insertions and nerve supply of vastus lateralis

Answer 10

Origins: lat intertrochanteric line, lateral pectineal line, lat lip of linea aspera, lateral margin of gluteal tuberosity
Insertions: lateral border of patella
Nerve supply: femoral nerve

Question 11

Origins, insertions and nerve supply of vastus medialis

Answer 11

Origins: medial lip of linea aspera, medial aspect of intertrochanteric line, medial supracondylar line
Insertions: medial border of patella
Nerve supply: femoral nerve

Question 12

Origins, insertions and nerve supply of vastus intermedius

Answer 12

Origins: femur, upper 2/3 anterior and lateral surfaces
Insertions: quadriceps tendon, lat border of patella
Nerve supply: femoral nerve

Question 13

Origins, insertions and nerve supply of sartorius

Answer 13

Origins: ASIS
Insertions: anterior surface of proximal tibia infromedial to tibia tuberosity
Nerve supply: femoral nerve

Question 14

Origins, insertions and nerve supply of gracilis

Answer 14

Origins: inferior pubic ramus
Insertions: medial surface, proximal shaft of tibia
Nerve supply: obturator nerve

Question 15

Origins, insertions and nerve supply of gastroc

Answer 15

Origins: medial head comes from medial femoral condyle, lateral head comes from lateral femoral condyle
Insertions: tendocalcaneus
Nerve supply: tibial nerve

Question 16

Origins, insertions and nerve supply of popliteus

Answer 16

Origins: lateral femoral condyle
Insertions: proximal surface of proximal tibia
Nerve supply: tibial nerve

Question 17

Origins, insertions and nerve supply of TFL

Answer 17

Origins: ASIS
Insertions: Gerdys tubercle, anterior surface of tibia
Nerve supply: superior gluteal nerve