It's the non-bony extension (continuation) of the ribs,
that connects the ribs and the sternum (breast bone),
thus forming a complete framework for the thoracic space.
At the thorax (ribs)
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If you are looking for a single bone meaning thorax, there isn't one. The thorax is a region or area of the body, rather than a singular bone name. The thorax is the part of the body from the neck to the diaphram. In insects, its the part of the body with the legs and wings. Its the middle segment in an arthropod. The bones in the thorax consists of the ribs, the spine and the cartilage sternum. These are a protective cage for the vital organs, the lungs and the heart. See the related link for more information.
No, they are bony fishes.
hyaline cartilage
No sharks are not 'bony'. The skeletal makeup of sharks is cartilage. Although cartilage is dense and can be bone-like it is significantly less dense than bone.
It means that the bones of the thorax, which includes the ribs and sternum, are all present and not fractured or damaged. In simpler terms, your ribcage is still in one piece and not broken. So, congratulations, your bony thorax is intact and ready to protect your precious organs!
bony; the only cartilaginous fish currently in existence are sharks, skates, and rays.
Ribs and sternum
heart, ribs, and sternum
The scapula
ribs and sternum