External Oblique Muscle

Description

External Oblique Muscle

Schematic of the chest wall musculature indicating the location of muscles. Inspiratory muscles including scalenes, external intercostals, parasternal intercostals and diaphragm are drawn on the left. Expiratory muscles are drawn on the right

Names

• External Obliques
• External Abdominal Oblique
• Obliquus Externus Abdominis
• Musculus Obliquus Externus Abdominis

Origin

• Ribs 5-12

Insertion

• Xiphoid Process
• Outer lip of the Iliac Crest
• Pubic crest
• Pubic tubercle
• Linea alba
• Inguinal Ligament
• Anterior Superior Iliac Spine (ASIS)

Actions

• Flexion of the torso
• Contralateral rotation of torso

Vascular Supply

• Lower intercostal arteries
• Deep circumflex iliac artery
• Iliolumbar artery

Innervation

• Thoracoabdominal nerves (T7-11)
• Subcostal nerve (T12)

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Clinical Significance

• Rib Fractures

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See Also

• Chest Pain Main
• Thoracic Anatomy Main
• Physical Exam Thorax

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