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Does anything about this system strike you as odd? The olfactory system disobeys a general rule of sensory systems - it does not have to pass through thalamus before reaching cortex. However, there is a very good reason why not; olfactory cortex is an old and primitive structure, and in fact has only four cellular layers, unlike the 6-layered cortex we are accustomed to. The rule that sensory information must pass through thalamus to get to cerebral cortex is still true, but only for 6-layered cortex, or neocortex. This description applies to almost every area in the frontal, parietal, occipital, and temporal lobes.

It also seems like the olfactory bulb does a lot of the processing and sends sensory info directly to the olfactory cortex.

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Q: Why does sense of smell bypass the thalamus?
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Related questions

Is the only sense in which signals can reach the cerebral cortex without passing first through the thalamus?

The sense of smell can bypass the thalamus, it is only secondarily sent through it when you are analyzing or comparing it to other smells.


What sense does not go through thalamus?

The sense of smell can bypass the thalamus, it is only secondarily sent through it when you are analyzing or comparing it to other smells.


What sense is not affected by damage to the thalamus?

smell


Signals from the neurons of which sense are NOT sent to the cortex by the thalamus?

Smell


Which type of sensory information does not pass through the thalamus?

A person's sense of smell does not first need to be processed by the Thalamus before entering the Cortex. This is often times why a smell can cause a memory recall faster than other kinds of sensory input.


Which sense system's information goes directly to the limbic system without passing first through the thalamus?

The sense of smell is directed through the limbic system without passing through the thalamus first.


What special senses is relayed directly to the cerebral cortex without going to the thalamus?

Its smell Information goes to olfactory cortex of the frontal lobe without going through the thalamus. Its the only major sense that does not go through the thalamus


What receives and transmits all sensory impulses except smell?

Thalamus


What Sense is not routed through thalamus before processing?

The sense of Olfaction or smell. Unlike the rest of the senses which are routed through the thalamus, olfaction goes through the olfactory cortex in the temporal lobe and to the limbic system which is associated with memory. That is the reason smell is strongly associated with emotion is due to it's ties to the limbic system. Source; http://en.wikipedia.org/wiki/Olfaction


Brain structure that receives messages from sense organs?

Thalamus


Which brain structure receives information from all the senses except smell?

Thalamus


What receptors sends messages to your brain which allows you to smell?

thalamus (novanet)