INTERNAL OBLIQUE

ORIGIN

Lumbar fascia, anterior two-thirds of the iliac crest, and the lateral two-thirds of the inguinal ligament

 

INSERTION

Costal margin, aponeurosis of the rectus sheath, conjoined tendon to the pubic crest and pectineal line, 10-12 rib

 

ACTION

Compresses abdomen; unilateral contraction rotates vertebral column to same side

 

INNERVATION

Ventral Primary rami of (T6 to T12, L1)

 

PRIMARY JOINT

Lumbar spine

Thoracic spine

 

KEY STRENGTH TRAINING EXERCISES

Sit-ups

Reverse twists

Dumbbell side bends

 

NEW STRENGTH TRAINING EXERCISES

Crunches with leg raises

Side crunches

 

COMMON INJURIES

Straining/stiffness

Tear