Internal Obliques
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.
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.
- Sitting twist using a resistance band.
- Standing twist using a resistance band.
Example stretches
- Side stretch.
Related injuries
- Abdominal strain.
Related muscles
- External obliques.
- Rectus abdominus.
