The internal obliques wrap around the waist and insert into the linea alba, a cord like strip of connective tissue running down the centre of the abdomen. They help to side bend and twist the body.
Origin - Iliac crest.
Insertion - Lower 3-4 ribs.
Actions - Contraction of one side alone laterally bends the trunk to that side and rotates the trunk to the other side.
Compresses the abdomen and supports the abdominal viscera.
Innervation - Ventral rami of thoracic nerves.
Daily uses - Raking leaves.
Example strengthening exercises - Twisting crunches.