Internal Obliques

Internal Oblique Muscle

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.
Inguinal ligament.
Thoracolumbar fascia.

Insertion - Lower 3-4 ribs.
Linea alba.

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.
Ilioinguinal nerve.
Iliohypgastric nerve.

Daily uses - Raking leaves.

Example strengthening exercises - Twisting crunches.

Related muscles categories: