MSK Session 6b: anterior thigh

Question 1

General function of anterior thigh mucles?

Answer 1

Flex at hip, extend at knee

Question 2

Psoas major origin?

Answer 2

Transverse processes of all lumbar vertebrae

Question 3

Psoas major insertion?

Answer 3

Lesser trochanter of femur

Question 4

Psoas major innervation?

Answer 4

Anterior rami of L1,2,3

Question 5

Psoas major action?

Answer 5

Flexes at hip
Assists in lateral rotation
Stabilises hip-postural

Question 6

What is iliopsoas?

Answer 6

The name given to the psoas major and iliacus muscles, because they converge to one tendon

Question 7

Iliacus origin?

Answer 7

Iliac crest, iliac fossa, ala of sacrum

Question 8

Iliacus insertion?

Answer 8

Tendon of psoas major, lesser trochanter

Question 9

Iliacus innervation?

Answer 9

Femoral nerve (L2,L3)

Question 10

Iliacus action?

Answer 10

Flexes at hip
Assists in lateral rotation
Stabilises hip

Question 11

Psoas minor origin?

Answer 11

Sides&IVDs of T12-L5 vertebrae

Question 12

Psoas minor insertion?

Answer 12

Pectineal line

Iliopubic arch

Question 13

Psoas minor innervation?

Answer 13

Anterior rami of L1,L2

Question 14

Psoas minor action?

Answer 14

Flex and stabilise hip

Question 15

Pectineus form?

Answer 15

Flat quadrangular muscle, two layers (superficial and deep)

Question 16

Pectineus origin?

Answer 16

Superior pubic ramus

Question 17

Pectineus insertion?

Answer 17

Pectineal line (just inferior to lesser trochanter)

Question 18

Pectineus innervation?

Answer 18

Femoral (L2, 3), and branch from obturator

Question 19

Pectineus action?

Answer 19

ADduction
Flexion at hip
Assists medial rotation

Question 20

Sartorius form?

Answer 20

Longest muscle in body, superficial, strap-like, runs lateral to medial

Question 21

Sartorius origin?

Answer 21

ASIS

Question 22

Sartorius insertion?

Answer 22

Superior part of the medial part of the tibia

Question 23

Sartorius innervation?

Answer 23

Femoral nerve (L2,L3)

Question 24

Sartorius action?

Answer 24

Flexion of thigh
ABduction hip
Lateral hip rotation
Flexes knee (medially rotates leg when knee flexed)

Produce the cross-legged sitting position

Question 25

Name the knee extensors

Answer 25

``` Quadriceps femoris (4 heads): Rectus femoris Vastus lateralis Vastus medialis Vastus intermedius ```

Question 26

Quadriceps femoris innervation?

Answer 26

Femoral nerve (L2, L3, L4) (mainly 3 and 4)

Question 27

Quadriceps femoris insertion?

Answer 27

1. Quadriceps tendon to base of patella 2. Patellar ligament to tibial tuberosity 3. VM and VL also attach to tibia and patella via aponeuroses

Question 28

Quadriceps femoris action?

Answer 28

Extend knee | RF also steadies hip and helps iliopsoas flex thigh

Question 29

Rectus femoris origin?

Answer 29

ASIS and ilium (superior to acetabulum)

Question 30

Vastus lateralis origin?

Answer 30

Greater trochanter and lateral lip of linea aspera

Question 31

Vastus medialis origin?

Answer 31

Intertrochanteric line and medial lip of linea aspera | The most medial of the quadriceps

Question 32

Vastus intermedius origin?

Answer 32

Anterior and lateral surfaces of femoral shaft