The cerebellum of cartilaginous and bony fishes is extraordinarily large and complex. These aggregates of bony matrix are called bone spicules. The knee cap sliding across the bony ridges of the femur can cause some pain. Computed tomography can be helpful in evaluating bony vertebral abnormalities, such as fractures. Shark skeletons are very different from those of bony fish and terrestrial vertebrates. The muscles of the trunk connect to a bony opening in the skull. Its most notable feature is the lack of a bony carapace. They also have gill covers or opercula like bony fishes. The orbits are large and separated by a bony septum. Radiotherapy may also be used to help with pain associated with bony lesions. The armadillos are small mammals with a bony armored shell. Lepidotrichia are bony, bilaterally-paired, segmented fin rays found in bony fishes. Sturgeons retain several primitive characters among the bony fishes. The similarity of these to the scales of bony fish is largely superficial. Larger fish, over fed largely on the larvae of bony fishes.