Bone metastasis may be the first sign that you have cancer, or bone metastasis may occur years after cancer treatment. Bone metastasis can cause pain and broken bones. With rare exceptions, cancer that has spread to the bones can't be cured. Treatments can help reduce pain and other symptoms of bone metastases.
Medical Definition of Chondrichthyes. : a class comprising cartilaginous fishes with well-developed jaws and including the sharks, skates, rays, chimeras, and extinct related formsâcompare cyclostomata.
Chondrichthyes (Cartilaginous Fish). In chondricthyes, or in cartilaginous fish, it is a cartilage skeleton rather than bones as the name indicates. Sharks, skates, rays are the prime example for living cartilaginous fish. There is no connection between their upper jaw and skull so that they can move it independently.