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.
Key features of Chondrichthyes. 1  Resemble bony fish and terrestrial vertebrates in having jaws, paired appendages, visceral arches located deeply next to the pharynx, an inner ear with three semicircular canals, and paired nasal cavities.2  An electroreceptive system is well developed.3  Skin with placoid scales and mucous glands; teeth of modified ... Resemble bony fish and terrestrial vertebrates in having jaws, paired appendages, visceral arches located deeply next to the pharynx, an inner ear with three semicircular canals, and paired nasal cavities. 2  An electroreceptive system is well developed.