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Abdominal Wall

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Hernias

  • Surround, and support abdominal contents

Skin

  • Segmental nerve supply from spinal roots

Muscles

  • External Oblique
    • lower 8 ribs, → iliac crest, linea alba.
    • Fibres down and medial
  • Internal Oblique
    • inguinal ligament, iliac crest, thoracolumbar fascia → inferior costal margin
  • Tranversus abdominis
    • inguinal ligament, lumbar fascia, lower 6 costal cartilages
    •  horizontally
  • Rectus Abdominis
    • runs in rectus sheath vertically

Peritoneum

  • serous membrane

Sites of weakness

  • Deep inguinal ring
  • Transversalis fascia in posterior wall of inguinal canal
  • Femoral canal
  • Umbilical orifice
  • Para-umbilical
  • Epigastric
  • Incisional
  • Lateral border of rectus sheath (Spigelian)
  • Grynfeltt's space (lumbar, below 12th rib)
  • Petit's triangle (lumbar, just above iliac crest
 

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