Anterior Thigh Muscles

Question 1

Pectineus (Origin, Insertion, Innervation, Action-3)

Answer 1

Origin: Superior Ramus of pubis

Insertion: Pectineal line of femur (Just inferior to lesser trochanter)

Innervation: Femoral Nerve

Action:

• Adducts thigh
• Flexes thigh
• Medial Rotation of thigh

Question 2

Sartorius (Origin, Insertion, Innervation, Action-4)

Answer 2

Origin: ASIS

Insertion: Superior part of medial surface of tibia

Innervation: Femoral Nerve

Action:

• Flexes thigh
• Abducts
• Laterally rotates thigh
• Flexes leg at knee

Question 3

Psoas Major (Origin, Insertion, Innervation)

Answer 3

Origin: Sides of T12-L5 vert, transverse processes of all lumbar vert.

Insertion: Lesser trochanter of femur

Innervation: Anterior rami of lumbar nerves (L1, L2, L3)

Question 4

Iliacus (Origin-4, Insertion-2, Innervation)

Answer 4

Origin:

• Iliac crest
• Iliac fossa
• Ala of sacrum
• Anterior sacroiliac ligament

Insertion:

• Tendon of psoas major
• Lesser trochanter

Innervation: Femoral Nerve

Question 5

Iliopsoas Action

Answer 5

Flexes/stabilizes thigh at hip joint

Question 6

Rectus Femoris Origin

Answer 6

AIIS (Anterior Inferior Iliac Spine)

Also helps iliopsoas flex thigh

Question 7

Vastus Lateralis Origin-2

Answer 7

• Greater trochanter

- Lateral lip of linea aspera

Question 8

Vastus Medialis Origin-2

Answer 8

• Intertrochanteric line

- Medial lip of linea aspera

Question 9

Vastus Intermedius Origin

Answer 9

Anterior & Lateral surfaces of shaft of femur

Question 10

Quadriceps Femoris (Insertion, Innervation, Action)

Answer 10

Insertion:

• Quadriceps tenton->Base of patella->Patellar ligament->Tibial tuberosity
• Medial and lateral vasti aso attach to tibia & patella via aponeuroses (Medial and lateral patellar retinacula

Innervation: Femoral Nerve (L2,L3,L4)

Action: Extends leg at knee