After mating, the fertilized eggs may be laid by the mother, or they may develop either partially or fully inside the mother. The young get their nourishment either from a yolk sac or other methods, which are described in more detail below. Of the approximately 400 species of sharks, about 40% lay eggs. This is called oviparity. When the eggs are laid, they are in a protective egg case (which sometimes washes up on the beach and is commonly called a mermaid's purse).
X-rays: X-rays show the bones of the cervical spine. Most of the soft tissue structures of the spine, such as the nerves, discs, and muscles, do not show up on x-ray. X-rays can show problems that affect the bones, such as infection, fractures, or tumors of the bones.his shows up as weakness in the muscles the nerve goes to, numbness in the skin that the nerve goes to and pain where the nerve travels. In the neck, this condition is called cervical radiculopathy. Let's look at the different causes of cervical radiculopathy.
Ankle X-ray: An X-ray film of the ankle is most commonly used to determine a fracture, arthritis, or other problems. Stress X-ray: A doctor puts pressure on an injured ankle and takes an X-ray film. Also called a stress film or a stress test, this may uncover ankle problems unseen on regular X-rays.