The upper and lower extremities of humans offer many interesting points of comparison and of contrast. They and their individual components are homologous—i.e., of a common origin and patterned on the same basic plan. A long evolutionary history and profound changes in the function of these two pairs of extremities have led, however, to considerable differences between them. (3)
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The upper and lower extremities of humans offer many interesting points of
comparison and of contrast. They and their individual components are
homologous—i.e., of a common origin and patterned on the same basic
plan. A long evolutionary history and profound changes in the function of
these two pairs of extremities have led, however, to considerable
differences between them. (3)
• lower extremity-
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