ORIGIN

Straight head: from the anterior inferior iliac spine
Reflected head: on a curved line along the upper part of the acetabulum at the ilium

 

INSERTION

The quadriceps tendon along with the three vasti muscles, enveloping the patella then by the patellar ligament into the tibial tuberosity

 

ACTION

Extension of the leg at the knee

 

INNERVATION

Posterior division of the femoral nerve (L3 – 4)

 

PRIMARY JOINT

Acetabular femoral joint

 

KEY STRENGTH TRAINING EXERCISES

Lunges

Striaght leg raises

Snatch

 

NEW STRENGTH TRAINING EXERCISES

Isometric wall sit

Clean and jerk

Squats

 

COMMON INJURIES

Tear in muscle

Strain