8. Knee muscles

Question 1

List A) Extensors of the knee

Answer 1

Question 2

List B) Flexors of the knee

Question 3

Identify. Action & innervation?

Answer 3

Quadriceps Group

1. Rectus femoris muscle
2. Vastus lateralis muscle
3. Vastus intermedius muscle
4. Vastus medialis muscle

• > Action: knee extension
• > nerve supply: femoral nerve

Question 4

Identify

Answer 4

1. Semitendinosus muscle
2. Semimembranosus muscle
3. Gracilis muscle
4. Biceps femoris muscle (short and long head)

Question 5

Identify 1. O & I

Answer 5

1. Semitendinosus muscle
   origin: ischial tuberosity
   insertion: pes anserinus

Question 6

Identify 2. o & i

Answer 6

2. Semimembranosus muscle
   origin: ischial tuberosity
   insertion: radiates into the posterior capsule as the oblique
   popliteal ligament

Question 7

Identify 4. O & I

Answer 7

4. Biceps femoris muscle (short and long head)

1) short head -> origin: ischial tuberosity
2) short head-> origin: lateral lip of linea aspera, lateral intermuscular
septum

Insertion: head of fibula

Question 8

iNNERVATION OF

1. Semitendinosus muscle
2. Semimembranosus muscle

Answer 8

Sciatic nerve, tibial division (L5, S1, and S2)

Question 9

Identify 3. O & I

Answer 9

3. Gracilis muscle
   origin: inferior ramus of pubis
   insertion: pes anserinus, tibial tuberosity