This is contrasted with the human skeletal system, which is classified as an endoskeleton.
Similar spines are found in many Elasmobranchs, but they are simply inserted in the flesh, not articulated to the endoskeleton.
The endoskeleton is cartilaginous and true bone is never found.
The various bones composing the endoskeleton are united to one another either by sutures or by movable joints.
Perhaps the most striking feature of the endoskeleton of birds is its pneumaticity.
The alien had an endoskeleton, but he also had a hide that was like somewhat leathery chitin.
The alien had an endoskeleton, but he also had a tough hide that was somewhat like thick, leathery chitin.
The endoskeleton of the Newt, though ossified to a considerable extent, is more cartilaginous than is that of the frog.
The skeleton of the Mammalia consists almost solely of the endoskeleton.
Bone is in many cases exoskeletal, but it will be most conveniently described with the endoskeleton.
endoskeleton en·do·skel·e·ton (ěn'dō-skěl'ĭ-tn)
An internal supporting skeleton, derived from the mesoderm, that is characteristic of vertebrates and certain invertebrates.
The internal supporting framework of humans and other vertebrates, usually made of bone. Certain invertebrates, such as sponges and echinoderms, also have endoskeletons. Compare exoskeleton.