Etymology: L, crena, notch. the formation of notches or leaflike scalloped edges on an object. Red blood cells exposed to a hypertonic saline solution acquire a notched, shriveled surface as a result of the osmotic effect of the solution. They are then called crenated red blood cells. crenate, crenated, adj.
Occipital neuralgia is the neck/head pain that results from injury or irritation to the occipital nerves. It can be caused by trauma, such as a car accident, by a pinched nerve root in the neck (from arthritis, for example) or by âtightâ muscles at the back of the head that entrap the nerves.
Causes of occipital lymph node swelling. Swelling of occipital lymph node rarely develops due to cancers. In most cases, the cause of the condition may be an infected puncture or cut, bug bite, lice, ringworm, dandruff or an episode of infection by viruses, bacteria or fungus. In such cases, it is important to keep a watch over the size of the occipital lymph nodes.