Norepinephrine is released when a host of physiological changes are activated by a stressful event.
In the brain, this is caused in part by activation of an area of the brain stem called the locus ceruleus. This nucleus is the origin of most norepinephrine pathways in the brain. Noradrenergic neurons project bilaterally (send signals to both sides of the brain) from the locus ceruleus along distinct pathways to many locations, including the cerebral cortex, limbic system, and the spinal cord, forming a neurotransmitter system.
Norepinephrine is also released from postganglionic neurons of the sympathetic nervous system, to transmit the fight-or-flight response in each tissue, respectively. The adrenal medulla can also be counted to such postganglionic nerve cells, although they release norepinephrine into the blood.
Read more about this topic: Norepinephrine
Other articles related to "origins, origin":
... X-Men Origins Wolverine is a 2009 American superhero film based on the Marvel Comics' fictional character Wolverine ... X-Men Origins Wolverine was released worldwide on May 1, 2009 and their reviews were generally unfavorable, with critics considering the film and its screenplay ...
... The origins of the common names "butterfly"and "moth" are varied and often obscure ... Other than that, the origin is unknown, although it could be derived from the pale yellow color of many species' wings suggesting the color of butter ... The origins of the English word moth are more clear, deriving from the Old English moððe" (cf ...
... The Zanja Madre was placed at a location close to present-day Broadway Street at the foot of the Elysian Hills by the river ... An earth and brush dam, called a toma, was created to pool up the water into the ditch which then ran along an elevated slope down to the pueblo after which it was split into multiple ditches which ran to the various portions of lowland ...
... Originally called the "Collegiate School", the institution opened in the home of its first rector, Abraham Pierson, in Killingworth (now Clinton) ... The school moved to Saybrook, and then Wethersfield ...
Famous quotes containing the word origins:
“Compare the history of the novel to that of rock n roll. Both started out a minority taste, became a mass taste, and then splintered into several subgenres. Both have been the typical cultural expressions of classes and epochs. Both started out aggressively fighting for their share of attention, novels attacking the drama, the tract, and the poem, rock attacking jazz and pop and rolling over classical music.”
—W. T. Lhamon, U.S. educator, critic. Material Differences, Deliberate Speed: The Origins of a Cultural Style in the American 1950s, Smithsonian (1990)
“Grown onto every inch of plate, except
Where the hinges let it move, were living things,
Barnacles, mussels, water weedsand one
Blue bit of polished glass, glued there by time:
The origins of art.”
—Howard Moss (b. 1922)
“The origins of clothing are not practical. They are mystical and erotic. The primitive man in the wolf-pelt was not keeping dry; he was saying: Look what I killed. Arent I the best?”
—Katharine Hamnett (b. 1948)