Muscles / Core
Internal oblique
- Core
- Abdomen
- Intermediate layer
Also called internal abdominal oblique, IO.
Anatomy
- Origin
- Thoracolumbar fascia, anterior two-thirds of the iliac crest, lateral inguinal ligament region
- Insertion
- Inferior borders of ribs 10-12, linea alba and pecten pubis via the conjoint tendon
- Nerve
- Thoraco-abdominal nerves (T7-T11), subcostal nerve (T12) and first lumbar nerve (L1) (T7-L1)
Actions
- Compresses the abdomen
- Flexes the trunk
- Unilaterally rotates the trunk to the same side and laterally flexes it
Exercises that train it most
Side bridge (side plank)
Side-lying thoracic rotation (open book)
Standing side bend with a dumbbell
Kneeling Pallof press
Also trained by
Supine leg slides / dead bug
McGill curl-up
Lower trunk rotation
Half-kneeling chop and lift
Stability-ball bridge
References (4)
- Standring S, ed. Elsevier. Gray's Anatomy: The Anatomical Basis of Clinical Practice. 42nd ed.
- Dalley AF, Agur AMR. Wolters Kluwer. Moore's Clinically Oriented Anatomy. 9th ed.
- Neumann DA. Elsevier. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. 3rd ed.
- Betts JG, Young KA, Wise JA, et al. OpenStax (free, openly licensed textbook). Anatomy and Physiology 2e