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Keywords: Olfactory; Behavior; Olfactory nerve transection; Ninjin-yoei-to; Traditional medicine; Regeneration
Within the olfactory nerve, the OECs form cellular channels or tunnels through which large numbers of small-caliber nonmyelinated axons distribute through the olfactory nerve into the outer nerve layer (ONL) of the OB and extend into the olfactory glomeruli, where they make synapses (Figure 1) [19].
When it collects an odor molecule that "fits," the olfactory nerve sends a signal to the brain.
Bertil Forsberg, professor of occupational and environmental medicine at UmeEN University, told the Swedish newspaper Dagens Nyheter that the researchers believed very small particles from traffic-related air pollution -- specifically the nitrogen oxide found in vehicle exhaust -- enters the brain through the olfactory nerve and causes direct damage.
When these mice smelled the odor associated with the electrical shocks, the amount of neurotransmitter, chemicals that carry communications between nerve cells, released from the olfactory nerve into the brain was as big as if the odor were four times stronger than it actually was.
Unfortunately, it also resulted in my olfactory nerve being inadvertently severed.
The list includes a neurotoxin from a shellfish that is water soluble, can be aerosolized, and causes death within minutes; a bacterium that can induce hallucinations, itchiness and strange tastes; and an amoebic microbe that crawls up the olfactory nerve to invade the brain, where it kills brain tissue.
The salmon does have a big olfactory nerve resulting in a strong sense of smell - but why should this drive it towards the female angler's fly?
BACKGROUND: Studies in monkeys with intranasally instilled gold ultrafine particles (UFPs; < 100 nm) and in rats with inhaled carbon UFPs suggested that solid UFPs deposited in the nose travel along the olfactory nerve to the olfactory bulb.
The olfactory mucous membrane that contains the cells of origin of the olfactory nerve fibers is limited primarily to the region of the superior concha, a corresponding portion of the nasal septum, and the roof of the nasal cavity (the area of the cribriform plate).
Aroma has a strong influence on emotion, because the olfactory nerve is the only sensorial nerve with direct access to the brain.
Previous hypotheses about the origin of these olfactory nerve cells have given credit to embryonic cells that develop into skin or the central nervous system, where ear and eye sensory neurons, respectively, are thought to originate.