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.
Before Hering came around, the view was that this massaging high up in the neck would stimulate the vagus nerve to the heart directly. He showed convincingly that the carotid sinus wall was deformed by the manipulation, thereby activating stretch receptors, which are innervated by a branch of the IX-nerve. These âbaroreceptorsâ are found on more places, like in the aortic arch, they serve together the âbaroreflexâ which tends to stabilize blood pressure, primarily at the cost of an unstable heart rate.