Musculoskeletal Anatomy of the Abdomen

Aka: Musculoskeletal Anatomy of the Abdomen, Abdominal Musculoskeletal Anatomy, Abdominal Muscle Wall Anatomy

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II. Anatomy: Anterior Abdominal Wall Muscles and Aponeuroses

  1. Midline components
    1. Rectus Abdominis Muscle
    2. Pyramidalis Muscle (suprapubic)
  2. Lateral components
    1. External oblique Muscle (most superficial)
    2. Internal oblique Muscle
    3. Transverse abdominis Muscle (deepest)
  3. Aponeuroses (abdominal Muscle attachments, sites prone to Herniation)
    1. Linea Alba (longitudinal midline)
    2. Linea Semilunaris (longitudinal lateral at rectus margin)
    3. Rectus Sheath (encases the rectus abdominis)

III. Anatomy: Anterior Abdominal Wall Nerves

  1. Origin
    1. T6 to L1 Spinal Nerve Ventral Rami
  2. Upper Abdominal Wall Innervation (T6 to T12)
    1. Anterior Cutaneous Branches
    2. Lateral Cutaneous Branches
  3. Lower Abdominal Wall Innervation (L1)
    1. L1 nerve bifurcates into iliohypogastric nerve and ilioinguinal nerve
    2. Iliohypogastric nerve passes through external oblique superior to Superficial Inguinal Ring
    3. Ilioinguinal nerve passes through Inguinal Canal and out the Superficial Inguinal Ring

IV. Anatomy: Images

  1. Trunk
    1. giMusclesTrunkGrayBB1219.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  2. Diaphragm
    1. giDiaphragmInferiorGrayBB391.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  3. Abdominal Wall
    1. giWallMuscleGrayBB392.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
    2. giWallMuscleGrayBB395.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
    3. giWallMuscleGrayBB397.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
    4. giWallMuscleXsGrayBB399.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
    5. giWallVesselsGrayBB584.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  4. Pelvis
    1. giPelvicBoneGrayBB394.gif Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)

V. References

  1. Shian (2018) Am Fam Physician 98(7): 429-36 [PubMed]

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