VNS is a form of stimulation whereby electricity is applied to the vagus nerve to modulate the central nervous system. The Vagus nerve is the 10 th cranial nerve, which runs from the brainstem, through the neck, down to the abdomen. Like DBS, VNS is done by surgically implanting a neurostimulator in the chest, while running a wire around the left vagus nerve. (Efferent heart fibers exist on the right.)
Define tut-tutting. tut-tutting synonyms, tut-tutting pronunciation, tut-tutting translation, English dictionary definition of tut-tutting. intr.v. tut-tutÂ·ted , tut-tutÂ·ting , tut-tuts To express annoyance, impatience, or mild reproof: those fussy fellows at the State Department tut-tutting...
Tuff (from the Italian tufo) is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is compacted into a solid rock in a process called consolidation. Tuff is sometimes called tufa, particularly when used as construction material, although tufa also refers to a quite different rock. Rock that contains greater than 50% tuff is considered tuffaceous. Tuff is a relatively soft rock, so it has been used for construction since ancient times.