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Internal oblique

Contents

Anatomy

Position

  • Deep to external oblique
  • Superifical to transversus abdominis

Origin

  • Lateral 2/3 of inguinal ligament
  • Crista iliaca
  • Thoracolumbar fascia

Insertion

  • Ribs 10-12
  • Abdominal aponeurosis

Main function

  • Trunk
    • Flexion
    • Lateral flexion
    • Ipsilateral rotation
  • Pelvis
    • Posterior tilt

Secondary function

  • Pelvis
    • Elevation
    • Contralateral rotation
  • Abdominal content
    • Compression

Segmental nerve innervation

  • Intercostal nerves

Arterial supply

  • Subcostal and posterior intercostal arteries

Symptoms

  • Postural distortion of pelvis
  • Dysfunctional gait
  • Loss of abdominal tone
  • Gas, bloating, belching, heartburn
  • Vomiting, diarrhea

Muscle type

  • Phasic
    • Weakens when overactivated

Muscle attachment zones

Videos

Short version

Detailed version

Spiral line