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Historical artwork of the superficial, right, and deeper, left, layers of muscles on the back of a human male body, undated picture. The skin and fascia (connective tissue) have been removed to expose the muscles and their points of attachment to the skeleton. Published in The Muscles of the Human Body; in a series of plates with references and physiological comments by Jones Quain in 1836. (KEYSTONE/SCIENCE PHOTO LIBRARY/Sheila Terry) === ===