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.
Osteichthyes are a very diverse group of bony fish. They are Ectothermic, which means they depend on the surrounding environment for their body temperatures. Osteichthyes live in all types of fresh and salt waters.steichthyes (Bony Fish) are the most species-rich and morphologically diverse lineage of all vertebrates. 1  brain. 2  spinal cord. 3  cranial nerves. 4  spinal nerves. 5  sensory organs 6  -. eyes-good eyesight. 7  no eyelids, thus permitting a maximum amount of. 8  light. 9  ears-no external opening.