In recent years, some taxonomic controversy has occurred over the genus of North American rat snakes. Based on mitochondrial DNA, Utiger et al. (2002) showed that North American rat snakes of the genus Elaphe, along with closely related genera such as Pituophis and Lampropeltis, form a monophyletic group separate from Old World members of the genus.
A pinched nerve is a type of injury or damage to a nerve or a group of nerves. The injury can result from compression, constriction, or stretching. A pinched nerve can lead to other conditions and cause temporary or permanent damage depending on the extent of the injury. pinched nerve is a type of injury or damage to a nerve or a group of nerves. The injury can result from compression, constriction, or stretching. A pinched nerve can lead to other conditions and cause temporary or permanent damage depending on the extent of the injury.
A pinched nerve occurs when excessive pressure is applied to a nerve by surrounding tissues â such as bones, cartilage, muscles or tendons. This pressure disrupts the nerve's function, causing pain, tingling, numbness or weakness.A pinched nerve can occur in a number of areas in the body, as well as in the spine.A herniated disc in your neck or back may cause numbness and pain in your extremities, bone spurs, degenerative disc disease, and various bony changes may compress nervous tissues.The cranium bones may also compress nerves that may cause head and neck pain. A number of conditions may cause tissue to compress nerves. herniated disc in your neck or back may cause numbness and pain in your extremities, bone spurs, degenerative disc disease, and various bony changes may compress nervous tissues. The cranium bones may also compress nerves that may cause head and neck pain. A number of conditions may cause tissue to compress nerves.