knee myology

Question 1

rectus femoris

Answer 1

*Origin- Superior to acetabulum, AIIS
*Insertion- quadriceps tendon, base of patella – tibial tuberosiy via patella ligament
*Action- Extends knee, flexes hip
*Nerve- Femoral nerve

Question 2

vastus lateralis

Answer 2

*Origin- intertrochanteric line, greater trochanter, lateral lip linea aspera
*Insertion- quadriceps tendon, lateral border of patella – tibial tuberosity
via patella tendon
*Action- Extends the knee
joint
*Nerve- Femoral nerve

Question 3

vastus medialis

Answer 3

*Origin- lower part intertrochanteric line, medial lip of the linea aspera
*Insertion- quadriceps tendon, medial border of patella – tibial tuberosity via patella tendon
*Action- Extends the knee joint
*Nerve- Femoral nerve

Question 4

vastus intermedius

Answer 4

*Origin- Upper 2/3 anterior and lateral surfaces of femur
*Insertion quadriceps tendon, base of patella – tibial tuberosity via patella tendon
*Action- Extends the knee
joint
*Nerve- Femoral nerve

Question 5

sartorius

Answer 5

*Origin- ASIS
*Insertion- Medial surface of tibial shaft (Pes anserinus)
*Action- Flexion of knee (weak). Flexion, abduction, lateral rotation hip joint
*Nerve- Femoral Nerve

Question 6

bicep femoris

Answer 6

*Origin
>LH -lower medial facet of the ischial tuberosity & sacrotuberous ligament
>SH – linea aspera of femur
*Insertion- LH & SH insert onto the head of the fibular
*Action- flexes knee, extends hip
*Nerve- sciatic nerve

Question 7

semitendinosus

Answer 7

*Origin- Lower medial facet of the Ischial tuberosity
*Insertion- Attaches to medial tibial condyle (pes anserinus attachment)
*Action- Flexes leg at knee joint and extends thigh at hip joint
*Nerve- Tibial nerve from Sciaitc nerve

Question 8

semimembranosus

Answer 8

*Origin- Upper lateral facet of the Ischial tuberosity
*Insertion- Posteromedial surface of medial tibial condyle
*Action- Flexes knee, extends hip
*Nerve- tibial nerve from sciaitic nerve

Question 9

popliteus

Answer 9

*Origin- Lateral epicondyle of femur
*Insertion- Proximal posterior aspect of tibia
*Action- Flexes knee and medially rotates tibia (screw home mechanism)
*Nerve- Tibial nerve