endoskeleton
internal skeleton
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
endoskeleton An internal supporting skeleton with muscles on the outside; in vertebrates, consists of the skull, spinal column, ribs, and appendages.
endoskeleton A skeleton that lies beneath the surface of the body (e.g., the bony skeleton of vertebrates and the calcium carbonate skeleton of echinoderms); contrasts with exoskeleton.
The endoskeleton and muscles form an organ system (the musculoskeletal system) that permits rapid and efficient movement. The pectoral and pelvic fins of fishes evolved into jointed appendages that allowed vertebrates to move onto land.
A human skeleton - (endoskeleton)
In biology, the skeleton or skeletal system provides a strong, internal framework that supports the body, makes up about 20 percent of its weight, and consists of 206 bones.
While you have an endoskeleton, a crab has a tough shell that protects it from the outside world. Next on the list are the arms and legs. They have jointed appendages. That's what the name arthropod means. jointed leg.
Bone
The vertebrate body is supported by an endoskeleton made of cartilage and bone. (Sharks and their relatives use only cartilage.)
The bones of the human skeleton perform several functions: ...
Some of the minerals such as calcium and phosphate are used in larger amounts by organisms when they are used to build structures such as bones and shells (exo and endoskeletons).
 See also: Organ, Skeleton, Blood, Tissue, Animal
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