Muscles of the Lower Limb (Anterior Compartment of the Thigh)

Question 1

Pectineus

Answer 1

O - Pectineal line of superior pubic ramus
I - Pectineal line of femur
NS - Femoral nerve
AS -
A - Adducts and flexes thigh, assists medial rotation

Question 2

Psoas

Answer 2

O - T12, L1-L5 transverse processes and intervertebral discs
I - Lesser trochanter
NS - Anterior rami lumber nerves (L1-L3)
AS -
A - Flex thigh, stabilise hip, flex and sidebend trunk

Question 3

Iliacus

Answer 3

O - Iliac crest and fossa, sacral ala
I - Lesser trochanter
NS - Femoral nerve
AS - 
A - Flex thigh, stabilise hip

Question 4

Sartorius

Answer 4

O - ASIS
I - Pes anserinus (superior medial tibia)
NS - Femoral nerve (L2-L3)
AS -
A - Flexion, abduction, internal rotation of hip, slight knee flexion (with medial rotation)

Question 5

Rectus Femoris

Answer 5

O - AIIS and ilium superior to acetabulum
I - Quadriceps tendon to base of patella, patella ligament to tibial tubersoity
NS - Femoral nerve (L2-L4)
AS -
A - Extend knee, assist hip flexion

Question 6

Vastus Lateralis

Answer 6

O - Greater trochanter and lateral lip of linea aspera
I - Quadriceps tendon and lateral retinaculum
NS - Femoral nerve (L2-L4)
AS -
A - Extend knee

Question 7

Vastus Intermedius

Answer 7

O - Anterior and lateral surfaces of femur
I - Quadriceps tendon to base of patella, patella ligament to tibial tubersoity
NS - Femoral nerve (L2-L4)
AS -
A - Extend knee

Question 8

Vastus Medialis

Answer 8

O - Intertrochanteric line and medial lip of linea aspera
I - Quadriceps tendon and medial retinaculum
NS - Femoral nerve (L2-L4)
AS -
A - Extend knee