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Why
Are Our Fingers Different Lengths?
Anatomically, our fingers (and toes) are
digits. People, like all four-legged
vertebrate animals, have digits that are
characteristic of the class (amphibians,
reptiles, mammals) and order (rodents,
carnivores, primates) to which they belong.
Thus, people have five fingers of a length
characteristic for the hands of primate
mammals. Of course, there is variation among
different species and even variation among
individual members of the same species. Some
people have ring fingers noticeably longer
than their index finger and some people have
second toes longer than their "big"
toe. Is there any reason for this? It is
thought that length is an adaption to swinging
in trees initially, and then a further
adaption to picking things up. An "even
hand" would be less versatile. For
example, a long little finger would get
smashed more often. Furthermore, there is
evidence that we can move around more
effectively with smaller outer toes. Over
time, higher vertebrates have a tendency to
lose some structures altogether. Horses for
example have lost all but one toe. Humans
might lose a digit or two over the next few
hundred million years. Unfortunately, none of
us will be here to find out.
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