Answer :
Fibers from the olfactory bulb go directly to the amygdala, which sends smell information to the hypothalamus, thalamus, and frontal cortex. the neural connections from the amygdala to the hippocampus may explain why smells can instantly evoke emotional memory.
The olfactory bulb provides olfactory information to the orbitofrontal cortex (OFC), the hippocampus, and the amygdala for further processing, where it is involved in emotion, memory, and learning. The olfactory bulb, or smell center of the brain, receives scents directly without passing via the thalamus. The amygdala and hippocampus are closely related to the olfactory bulb, which may help to explain how quickly a specific memory or even a strong emotion may be evoked by smelling something.
Located in the central part of the temporal lobe, the hippocampus and amygdala are two brain regions that occasionally communicate with one another. Just anterior to (in front of) the hippocampus in the medial temporal lobe is where the amygdala is situated. The amygdala is a paired structure that is found in each hemisphere of the brain, much like the hippocampus.
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