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.
1 X-rays can reveal areas in your neck where your nerves or spinal cord might be pinched by bone spurs or other degenerative changes.  CT scan. CT scans combine X-ray images taken from many different directions to produce detailed cross-sectional views of the internal structures of your neck.