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.
Along with the spinal nerves, the cranial nerves are part of the peripheral nervous system. There are twelve pairs of cranial nerves. Cranial Nerves Involved in Smell and Vision. CN I, the olfactory nerve, is a purely sensory nerve.