SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Abdominal spinal nerves. Historical anatomical artwork of the spinal nerves (white) in a human abdomen. This view, from the front, is obtained by removing most of the abdominal organs to reveal the muscles (red) of the back of the abdomen. The lumbar (lower) spine is seen at centre. At left is the right psoas muscle. The left psoas muscle has been removed to show a network of nerves (right) from the spinal cord. This network is called the lumbar plexus. Lower down is another network, the sacral plexus (both sides seen). The largest nerve seen in the lumbar plexus is the crural nerve (the one towards the leg). Artwork from The Nerves of the Human Body (Ed. Jones Quain, London, 1839).
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