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The amygdala is involved in the formation of memories of emotional experiences, particularly those associated with fear, flight, and defense. It is connected by various pathways to other parts of the brain, but most notably to the basal forebrain which contains magnocellular cells which provide extensive input into the neocortex and hippocampus ...
In animal anatomy, the rhinencephalon (from the Greek, ῥίς, rhis = "nose", and ἐγκέφαλος, enkephalos = "brain"), also called the smell-brain or olfactory brain, is a part of the brain involved with smell (i.e. olfaction). It forms the paleocortex and is rudimentary in the human brain. [citation needed]
The Lady and the Unicorn, a Flemish tapestry depicting the sense of smell, 1484–1500. Musée national du Moyen Âge, Paris.. Early scientific study of the sense of smell includes the extensive doctoral dissertation of Eleanor Gamble, published in 1898, which compared olfactory to other stimulus modalities, and implied that smell had a lower intensity discrimination.
Brain scanning studies have shown that the sense of smell connects with many aspects of thinking, said Benjamin tenOever, chair of the department of microbiology at the New York University Langone ...
The olfactory bulb transmits smell information from the nose to the brain, and is thus necessary for a proper sense of smell. As a neural circuit , the glomerular layer receives direct input from afferent nerves , made up of the axons from approximately ten million olfactory receptor neurons in the olfactory mucosa , a region of the nasal cavity .
Age is the strongest reason for olfactory decline in healthy adults, having even greater impact than does cigarette smoking. Age-related changes in smell function often go unnoticed and smell ability is rarely tested clinically unlike hearing and vision. 2% of people under 65 years of age have chronic smelling problems.
Due to the impact smell has on the human brain and the reception of different people, it can impact whether or not an individual accepts another individual. Bad smells can drive people away due to the harsh nature of the odors, whereas nice smelling fragrances can communicate positively. [ 10 ]
The specialized olfactory receptor neurons of the olfactory nerve are located in the olfactory mucosa of the upper parts of the nasal cavity.The olfactory nerves consist of a collection of many sensory nerve fibers that extend from the olfactory epithelium to the olfactory bulb, passing through the many openings of the cribriform plate, a sieve-like structure of the ethmoid bone.