Internal Abdominal Oblique

Muscle Origin

Iliac crest to costal cartilages of ribs 7-12 and the linea alba.
Inguinal ligament, Iliac crest and the Lumbodorsal fascia.

Lumbar fascia, anterior two-thirds of the iliac crest, and the lateral two-thirds of the inguinal ligament.anatomy-model-muscles-033-edited-4


Linea alba, Pecten Pubis (via Conjoint tendon) and ribs 10-12

Costal margin, aponeurosis of the rectus sheath, conjoined tendon to the pubic crest and pectineal line, 10-12 rib. The internal abdominal oblique muscle lies on the sides and front of the abdomen and is the intermediate of the three flat muscles in this area, below the external oblique and above the transverse abdominal muscle. It is broad, thin and irregularly four-sided and occupies the lateral walls of the abdomen, stretching across to the front. Innerbody


Flexes vertebral column.

Compresses abdomen; unilateral contraction rotates vertebral column to same side. Both sides, acting together, flex the vertebral column by drawing the pubis toward the xiphoid process. One side also bends the vertebral column sideways and rotates it, bringing the shoulder of that side forward. Both of the abdominal oblique muscles work to compress abdominal contents, assist in the digestive process and in forced expiration. Innerbody

Innervation – Nerve control

Thoracoabdominal nn. (T6-T11), Subcostal n. (T12), Iliohypogastric n. (L1) and Ilioinguinal n. (L1)

The internal oblique is innervated by the lower intercostal nerves, as well as the iliohypogastric nerve and the ilioinguinal nerve. Wiki


Subcostal arteries.

The subcostal arteries, so named because they lie below the last ribs, constitute the lowest pair of branches derived from the thoracic aorta, and are in series with the intercostal arteries. Wiki

Antagonist muscles


Pictures of muscles


Trigger Point Referrals


Stretching description








Additional Resources

Chandler Physical Therapy © 2014 Frontier Theme