Anterior Thigh

Question 1

Psoas Major

Answer 1

Origin: TP of L1-L5, vertebral bodies of T12-L5, adjacent IVDs
Insertion: Lesser trochanter of femur
Action: Hip flexion
Innervation: Anterior rami of 1st, 2nd, 3rd lumbar nerves

Question 2

Iliacus

Answer 2

Origin: Iliac crest, superior 2/3 of iliac fossa
Insertion: Lesser trochanter of femur, via tendon of psoas major (Iliopsoas)
Action: Hip flexion
Innervation: Femoral n.

Question 3

Pectineus

Answer 3

Origin: Superior pubic ramus
Insertion: Pectineal line of femur
Action: Hip flexion & adduction
Innervation: Femoral & obturator nerves

Question 4

Sartorius

Answer 4

Origin: ASIS
Insertion: Medial aspect of proximal tibia
Action: Knee flexion & internal rotation. Hip flexion, abduction, external rotation
Innervation: Femoral n.

Question 5

Rectus femoris

Answer 5

Origin: AIIS, supraacetabular groove of ilium
Insertion: Tibial tuberosity, via quadriceps femoris muscles & patella ligament
Action: Hip flexion, knee extension
Innervation: Femoral n.

Question 6

Vastus medialis

Answer 6

Origin: Medial part of intertrochanteric line, medial lip of linea aspera of femur, pectineal line (spiral line)
Insertion: Tibial tuberosity, via quadriceps femoris muscles & patella ligament
Action: Knee extension
Innervation: Femoral n.

Question 7

Vastus lateralis

Answer 7

Origin: Intertrochanteric line, greater trochanter, gluteal tuberosity, lateral lip of linea aspera
Insertion: Tibial tuberosity, via quadriceps femoris muscles & patella ligament
Action: Knee extension
Innervation: Femoral n.

Question 8

Vastus
intermedius

Answer 8

Origin: Anterior & lateral body of femur
Insertion: Tibial tuberosity, via quadriceps femoris muscles & patella ligament
Action: Knee extension
Innervation: Femoral n.