Anterior Compartment Of Thigh

Question 1

What are the muscles in the anterior compartment of the thigh (8)

Answer 1

Psoas major, iliacus, rectus femoris, vastus medialis/lateralis/intermedius, sartorius and pectineus

Question 2

What are they all innervated by (except one) and what’s the exception?

Answer 2

All innervated by the femoral nerve, except the psoas major which is innervated by the anterior rami of L1-3.

Question 3

Origin of psoas major

Answer 3

Lumbar vertebrae

Question 4

Origin of iliacus

Answer 4

Iliac fossa

Question 5

Insertion of iliopsoas

Answer 5

Lesser trochanter

Question 6

Action of iliopsoas

Answer 6

Flexion of thigh at hip joint

Question 7

Origin of rectus femoris

Answer 7

AIIS and ilium

Question 8

Insertion of rectus femoris

Answer 8

Patella via quadriceps tendon

Question 9

Action of rectus femoris

Answer 9

Extension of knee joint and flexion of hip joint

Question 10

Origin of 3 vastus muscles.

Answer 10

Lateralis= greater trochanter
Medialis= intertrochanteric line
Intermedius= anterior and lateral surfaces of femoral shaft

Question 11

Insertion of vastus muscles

Answer 11

Patella via quadriceps tendon

Question 12

Action of vastus muscles.

Answer 12

Extension of knee joint, secondary function of stabilising the patella

Question 13

Origin of sartorius

Answer 13

ASIS

Question 14

Insertion of sartorius

Answer 14

Superior, medial surface of tibia

Question 15

Action of sartorius

Answer 15

Flexor, abductor and lateral rotator at hip joint. Flexor at knee joint.

Question 16

Origin of pectineus

Answer 16

Pectineal line of pubis bone

Question 17

Insertion of pectineus

Answer 17

Pectineal line of femur

Question 18

Action of pectineus

Answer 18

Adduction and flexion at hip joint