Anterior Abdominal Wall

• External oblique
  • Bony Attachments:
    • 1. External surface of Ribs 5-12
    • 2. Linea alba, pubic tubercle, ant. iliac crest, xiphoid process
  • Innervation: Inf. 6 intercostal nerve; Subcostal n.;Iliohypogastric n.
  • Arterial Supply: Superior, deep, and inferior epigastric a.
  • Action: Flex and rotate trunk; Compresses and supports the abdominal viscera
• Internal oblique
  • Bony Attachments:
    • 1. Thoracolumbar fascia, iliac crest, inguinal ligament
    • 2. Inferior border of 10-12 ribs, linea alba, Pubis
  • Innervation: Ant. rami of inferior 6 thoracic and first lumbar nerves
  • Arterial Supply: Superior, deep, and inferior epigastric a.
  • Action: Compresses and supports the abdominal viscera
• Rectus abdominus
  • Bony Attachments:
    • 1. Pubic symphysis and pubic crest
    • 2. Xiphoid process, 5-7th costal cartilages
  • Innervation: Ant. rami of inferior 6 thoracic nerves
  • Arterial Supply: Superior, deep, and inferior epigastric a.
  • Action: Flexes trunk and compresses abdominal viscera
• Transverse abdominus
  • Bony Attachments:
    • 1. Lower 6 costal cartilages, thoracolumbar fascia, iliac crest, inguinal ligament
    • 2. Linea alba, xiphoid process, and pubic symphysis
  • Innervation: Ant. rami of inferior 6 thoracic and first lumbar nerves
  • Arterial Supply: Superior, deep, and inferior epigastric a.
  • Action: Compresses and supports the abdominal viscera
• Pyramidalis
  • Bony Attachments:
    • 1. Body of pubis
    • 2. Linea alba
  • Innervation: Subcostal n.
  • Arterial Supply: Superior, deep, and inferior epigastric a.
  • Action: Tenses linea alba