The Evolution of Hands and Feet
LM Publishers
Date de publication

The Evolution of Hands and Feet

LM Publishers


  • AideEAN13 : 9782366599299
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In the great family of the animals, to which we ourselves belong, many
different kinds of feet and hands are to be found. This book deals with the
evolution of our feet and hands. “The succession of organic modifications
which resulted in the formation of the human hand is part of the general
process of evolution by which in the animal series the means of progression
and of the taking of food were shaped by the environmental conditions under
which life was carried on... The functions of life which call into service the
bodily limbs are chiefly two—locomotion, an activity which has arisen in
connection with the search for food and flight from enemies; and prehension,
which is concerned primarily with the grasping and tearing of food, but
secondarily also with processes assistive of locomotion and other biological
functions, such as sexual congress, the care of the body, burrowing and
climbing. Of these two functions, if we regard the vertebrate class only, the
former is the more primitive. Upon the office of locomotion the prehensive and
manipulative activities of the limb have been superposed as subsequent and
more specialized adaptations....”
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