Bursitis and tendinitis are both common conditions that cause swelling around muscles and bones. They occur most often in the shoulder, elbow, wrist, hip, knee, or ankle. A bursa is a small, fluid-filled sac that acts as a cushion between a bone and other moving body parts such as muscles, tendons, or skin.
In higher vertebrates, such as reptiles, birds and mammals, there are 12 pairs of cranial nerves. Lower vertebrates, such as fish and amphibians, have 10 pairs of cranial nerves. Continue Reading.
How Many Cranial Nerves Are There? Nerves arising directly from the brain are called cranial nerves, while those arising from the spinal cord are called peripheral nerves. These nerves pass from the brain through openings in the skull called foramina, to supply various parts of the head and neck, although some have extensions to the body.