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danilosanmartin
The olfactory organ is Squidward's nose. The nose is called an olfactory organ because it is responsible for olfaction (from Latin word olfactus which means "to smell"). The exact mechanism why Squidward's nose shrivels up while laughing is physiologically unexplainable. 

It could be that he breathes out of his nose or somthing like that but im doubting it. also hes a cartoon caracter whut do you expect