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Royal Collection © Her Majesty Queen Elizabeth II
Recto: The lumbar plexus. Verso: The veins of the pelvic and lumbar region
Recto: a drawing of the lumbar plexus and its peripheral distribution; the nerves and the spinal column. Verso: The left iliac vein and tributaries: to the left, details of the subcostal veins and the formation of the azygos system; notes on the anatomical drawings and the list of twelve anatomical representations either done or to be done by Leonardo.