The internal oblique muscles are opposite to the external oblique muscles and are responsible for movement on the side that it is situated, so the right internus abdominal muscle twists to the right and the left internus abdomianal muscle twists to the right.

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

How can I stretch it?

How can I strengthen it?

Neck and Back Muscles:

More Human Muscles: