A&P1.16

Question 1

Muscles of Anterior Compartment of Thigh: Quadricep Muscles - L, O, I, A

Vastus intermedius

Answer 1

L: Anterior thigh deep
O: Anterior & lateral surfaces of shaft of femur (just below greater trochanter)
I:
* Patella
* Tibial tuberosity via patella ligament

A: Extension of leg at knee

Parallel fibers

Question 2

Muscles of Anterior Compartment of Thigh: Quadricep Muscles: L, O, I, A

Vastus medialis

Answer 2

L: Anterior/medial thigh superficial
O: Linea aspera
I:
* Patella
* Tibial tuberosity via patella ligament

A: Extension of leg at knee

Oblique fibers

Question 3

Muscles of Anterior Compartment of Thigh: Quadricep Muscles: L, O, I, A

Vastus lateralis

Answer 3

L: Anterior/lateral thigh superficial
O:
* Greater trochanter
* Linea aspera of femur

I:
* Patella
* Tibial tuberosity via patella ligament

A: Extension of leg at knee

Oblique fibers

Question 4

Muscles of Anterior Compartment of Thigh: Quadricep Muscles: L, O, I, A

Rectus femoris

Answer 4

L: Anterior thigh superficial
O: AIIS of ilium
I:
* Patella
* Tibial tuberosity via patella ligament

A:
- Extension of leg at knee
- Flexion of thigh at hip

Bipennate fibers

Question 5

Muscles of Anterior Compartment of Thigh - L, O, I, A

Sartorius

Answer 5

L: Anterior/medial thigh superficial
O: ASIS of ilum
I: Medial condyle of tibia (part of Pes anserinus)
A:
- Flexion, ABduction & lateral rotation of thigh at hip
- Flexion of leg at knee

Parallel fibers

• “Tailor’s muscle”
• Longest muscle in the body

Question 6

Attachments of Anterior Thigh

Common quadricep tendon

Answer 6

• Runs between the quadriceps and the patella to help guide the quadriceps over the knee joint
• Quad ms. -> patella -> tibial tuberosity