endoskeleton

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endoskeleton

the internal skeleton of an animal, esp the bony or cartilaginous skeleton of vertebrates

endoskeleton

[¦en·dō′skel·ə·tən]
(zoology)
An internal skeleton or supporting framework in an animal.
References in periodicals archive ?
In most echinoderms it encloses the animal body like an external shell, and yet it is an endoskeleton that is covered with a thin epidermis separating the skeleton from external surroundings.
Indeed, a great many traits in complex organisms, from the four nucleotide bases that comprise the genetic `alphabet' to the homeobox gene complex, nucleated eukaryotic cells and endoskeletons, represent evolutionary inventions that have been `conserved' over countless generations.
Consider: As people and other creatures with endoskeletons grow, their bones grow with them.