Muscles of the anterior compartment of the thigh

Question 1

Psoas major

Answer 1

Origin:

• Posterior abdominal wall (lumbar transverse processes, intervertebral discs, and adjacent bodies from TXII to LV and tendinous arches between these point)

Insertion:

• Lesser trochanter of femur

Innervation:

• Anterior rami (L1, L2, L3)

Function:

• Flexes the thigh at the hip joint

Question 2

Illiacus

Answer 2

Origin:

• Posterior abdominal wall (Iliac fossa)

Insertion:

• Lesser trochanter of femur

Innervation:

• Femoral nerve (L2, L3)

Function:

• Flexes the thigh at the hip joint

Question 3

Vastus medialis

Answer 3

Origin:

• Femur - medial part of intertrochanteric line, pectineal line, medial lip of the line aspera, medial supracondylar line

Insertion:

• Quadriceps demoris tendon and medial border of patella

Innervation:

• Femoral nerve (L2, L3, L4)

Function:

• `Extends the leg at the knee joint

Question 4

Vastus intermedius

Answer 4

Origin:

• Femur - upper two thirds of anterior and lateral surfaces

Insertion:

• Quadraceos femoris tendon, lateral margin of patella and lateral condyle of tibia

Innervation:

• Femoral nerve (L2, L3, L4)

Function:

• Extends the leg as the knee joint

Question 5

Vastus lateralis

Answer 5

Origin:

• Femur - Lateral part of the intertrochanteric line, margin of greater trochanter, lateral margin of gluteal tuberosity, lateral lip of the line aspera

Insertion:

• Quadriceps femoras tendon and lateral margin of parole

Innervation:

• Femoral nere (L2, L2, L4)

Function:

• Extends the leg at the knee joint

Question 6

Rectus femoris

Answer 6

Origin:

• Straight head originates from the anterior inferior iliac spine, reflected head originates from the ilium just superior to the acetabulum

Insertion:

• Quadriceps femoris tendon

Innervation:

• Femoral nerve (L2, L3, L4)

Function:

• Flexes the thigh at the hip joint and extends the leg at the knee joint

Question 7

Satorius

Answer 7

Origin:

• Anterior superior iliac spine

Insertion:

• Medial surface of tibia just inferomedial to finial tuberosity

Innervation:

• Femoral nerve (L2, L3)

Function:

• Flexes the thigh at the hip joint and flexes the leg as the knee joint