SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Drawing by Leonardo da Vinci of the dissection of the foot of a bear. Leonardo sought to compare the anatomy of humans with animals. Bears are the only large mammals that walk in a way similar to humans and to investigate this he made a series dissections of a bear's foot. In this drawing he concentrated on the tendons of the bear's foot and their attachments to the bones. An upper extensor tendon has raised the farthest claw.
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