Muscles + innervation

Question 1

Knee flexors

Answer 1

Primary - hamstrings
1. Semimembranosus
2. Semitendinosus
3. Long head biceps femoris
4. Short head biceps femoris

Secondary
1. Gracilis
2. Gastronemius (lateral + medial head)
3. Plantaris
4. Popliteus
5. Sartorius

Question 2

Knee extensors

Answer 2

Primary - quadriceps
1. Rectus femoris
2. Vastus medius
3. Vastus intermedius
4. Vastus lateralis

Secondary
1. Iliotibial tract (ITB)
2. tensor fascia latae (TFL)

Question 3

Knee internal rotators

Answer 3

1. Gracilis
2. Sartorius
3. Semitendinosus
4. Semimembranosus
5. Popliteus

Question 4

Knee external rotators

Answer 4

1. Short head biceps femoris
2. Long head biceps femoris

Question 5

Nerve supply of knee flexors

Answer 5

1. hamstrings - tibial and common fibular divisions of sciatic nerve
2. gastrocnemius, plantaris, popliteus - tibial nerve
3. gracilis - obturator nerve
4. sartorius - femoral nerve

Question 6

Nerve supply of knee extensors

Answer 6

Femoral nerve

Question 7

Nerve supply of knee internal rotators

Answer 7

1. gracilis - obturator nerve
2. sartorius - femoral nerve
3. popliteus - tibial nerve
4. hamstrings - tibial and **common fibular **branches on sciatic nerve

Question 8

Nerve supply of external rotators

Answer 8

Scatic nerve

Question 9

Semitendinosus

Answer 9

O: ischial tuberosity
I: medial aspect of proximal part of tibia

Question 10

Semimembranosus

Answer 10

O: ischial tuberosity
I: medial condyle of tibia

Question 11

Long head biceps femoris

Answer 11

O: ischial tuberosity
I: head of fibula

Question 12

Short head biceps femoris

Answer 12

O: linea aspera
I: head of fibula

Question 13

Gracilis

Answer 13

O: body of pubis and inferior pubic ramus
I: medial aspect of proximal part of tibia

Question 14

Sartorius

Answer 14

O: ASIS (anterior superior iliac spine)
I: medial aspect of proximal part of tibia

Question 15

Gastrocnemius

Answer 15

O: condyle of femur
I: posterior surface of calcaneus via calcaneal tendon

Question 16

Plantaris

Answer 16

O: lateral supracondylar line of femur
I: posterior surface of calcaneus

Question 17

Popliteus

Answer 17

O: groove for popliteus muscle
I: posterior surface of tibia

Question 18

Pes anserine

Answer 18

Region where these muscles join to insert at medial knee
1. semitendinosus
2. gracilis
3. sartorius

Question 19

Rectus femoris

Answer 19

O: anterior inferior iliac spine
I: tibial tuberosity via quadriceps femoris muscle and patellar ligament

Question 20

Vastus medialis

Answer 20

O: Medial part of intertrochanteric line and medial to the spiral line and linea aspera of femur
I: tibial tuberosity via quadriceps femoris muscle and patellar ligament

Question 21

Vastus intermedius

Answer 21

O: anterior and lateral surfaces of body of femur
I: tibial tuberosity via quadriceps femoris muscle and patellar ligament

Question 22

Vastus lateralis

Answer 22

O: greater trochanter
I: tibial tuberosity via quadriceps femoris muscle and patellar ligament

Question 23

Iliotibial tract (IT band)

Answer 23

O: anterolateral iliac tubercle portion of external lip of the iliac crest
I: lateral condyle of tibia

Question 24

Tensor fascia latae (TFL)

Answer 24

O: ASIS (anterior superior iliac spine)
I: iliotibial tract

Question 25

Anterior cruciate ligament (ACL)

Answer 25

Question 26

Posterior cruciate ligament (PCL)

Answer 26

Question 27

Medial collateral ligament (MCL)

Answer 27

Question 28

Lateral collateral ligament (LCL)

Answer 28

Question 29

Medial meniscus

Answer 29

Question 30

Lateral meniscus

Answer 30