1. Subcostal — Anterolateral abdominal wall including muscles (external oblique)
  2. Iliohypogastric — Lower abdominal wall and upper thigh, muscles of lower abdominal wall (lower transversus abdominis, internal oblique)
  3. Ilioinguinal — Lower abdominal wall and scrotum, muscles of lower abdominal wall (internal oblique and transversus abdominis)
  4. Genitofemoral — Genital and femoral branches, skin of anterior scrotum medial thigh

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