The Principles of Anatomy As Seen in the Hand

Cover The Principles of Anatomy As Seen in the Hand
The Principles of Anatomy As Seen in the Hand
F Wood Frederic Wood Jones
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Whilst the possession of hairs is therefore limited to warm-blooded animals, and a hair covering is dis- tinctive of the Mammals, nails are an early acquirement of the digitate vertebrates, and are present in Amphibians, Reptiles, Birds, and Mammals.
The most primitive nails seen in the Amphibia are of especial interest, since their flattened form demands that they be classed as nails and not as claws, as talons, or as hoofs. It has been noted (Goppert) that the flattened nails of such tailed a
...mphibians as Onychodactylus are strikingly similar to those seen in some mammals ; but nevertheless in the bulk of the digitate reptiles and in the lower mammals the horny appendages of the digits present, not a flattened spatulate form properly termed a nail, but a highly arched and pointed structure which is more justly termed a claw. Broadly speaking, true nails are present only in the Primates among the Mammals, and we are therefore faced with an exceedingly difficult problem, for it must be admitted that if a flattened nail be the primitive form, it is remarkable that this primitive type should be present only in the highest mam- malian order.

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