lower 6 costal cartilages and ribs costal margin xiphoid process lumbar vertebrae pubic symphysis iliac crest anterior superior iliac spine anterior inferior iliac spine superior and inferior pubic rami pubic bone pubic crest iliac fossa ilium pubic tubercle external oblique rectus abdominis diaphragm psoas major quadratus lumborum iliacus internal oblique small intestine transverse colon ileum stomach gallbladder jejunum liver spleen doudenum ureter kidney descending colon adrenal gland rectum mesentery greater omentum mesocolon lateral cutaneous nerve of the thigh iliohypogastric nerve psoas major inguinal ligament obturator nerve femoral nerve lumbar spinal nerves ilioinguinal nerve quadratus lumborum common iliac veins common iliac arteries abdominal aorta inferior vena cava