Related topics: protein · dinosaurs · archaeologists

Novel ancient shark discovered

This rare fossil find comes from the Kimmeridge Clay Formation in England, a series of sedimentary rocks that was formed in a shallow, tropical-subtropical sea during the Upper Jurassic, about 150 million years ago. The fossil ...

How reef-building corals got their bones

Coral reefs provide shelter, sustenance and stability to a range of organisms, but these vital ecosystems would not exist if not for the skeletal structure created by stony corals. Now, KAUST scientists together with an international ...

'Planar and curved' pyrrole-fused azacoronenes

Recent study on synthetic approaches toward polycyclic aromatic hydrocarbons (PAHs) such as graphene with a well-defined structure have attracted much attention. A research group at Ehime University has been studying the ...

Israeli experts announce discovery of more Dead Sea scrolls

Israeli archaeologists on Tuesday announced the discovery of dozens of Dead Sea Scroll fragments bearing a biblical text found in a desert cave and believed hidden during a Jewish revolt against Rome nearly 1,900 years ago.

Microscope helps with dinosaur puzzle

Fossil sites sometimes resemble a living room table on which half a dozen different jigsaw puzzles have been dumped: It is often difficult to say which bone belongs to which animal. Together with colleagues from Switzerland, ...

150-million-year-old shark was one of the largest of its time

In a new study, an international research team led by Sebastian Stumpf from the University of Vienna describes an exceptionally well-preserved skeleton of the ancient shark Asteracanthus. This extremely rare fossil find comes ...

Researchers collaborate to aid coral reef restoration

Florida's threatened coral reefs have a more than $4 billion annual economic impact on the state's economy, and University of Central Florida researchers are zeroing in on one factor that could be limiting their survival—coral ...

Ancient DNA sheds light on the peopling of the Mariana Islands

To reach the Mariana Islands in the Western Pacific, humans crossed more than 2,000 kilometers of open ocean, and around 2,000 years earlier than any other sea travel over an equally long distance. They settled in the Marianas ...

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Skeleton

In biology, a skeleton is a rigid framework that provides protection and structure in many types of animal, particularly those of the phylum Chordata and of the superphylum Ecdysozoa. Exoskeletons are external, as is typical of many invertebrates; they enclose the soft tissues and organs of the body. Exoskeletons may undergo periodic moulting as the animal grows. Endoskeletons are internal, as is typical of many vertebrates; they are usually surrounded by skin and musculature, though they often enclose vital organs. Endoskeletons are attachment points for musculature and act as leverage for movement, and in many animals contain marrow, which produces blood cells. Skeletons may or may not be mineralized - human skeletons are calcified, while shark skeletons are cartilaginous - and may be jointed for flexibility and motility or rigid for structural strength.

The average adult human skeleton has around 206 bones. These bones meet at joints, the majority of which are freely movable. The skeleton also contains cartilage for elasticity. Ligaments are strong strips of fibrous connective tissue that hold bones together at joints, thereby stabilizing the skeleton during movement.

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