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(FRAME-INFO (STRING "Projection Pattern of Neurons in the Olfactory Epithelium. \(Schematic drawing compliments of Dr. R. Thorne\). Primary olfactory sensory neurons containing a particular type of odorant receptor \(indicated by color\) are distributed randomly in one of four rough geographic zones \(not shown\) within the olfactory epithelium of the nasal passages.  These olfactory sensory neurons give rise to axons that precisely project to one or a small number of unique glomeruli \(synapses with second-order olfactory neurons, the mitral and tufted cells\) within the olfactory bulb.  It appears that the two-dimensional spatial location of functionally distinct glomeruli are fixed within the two bulbs as well as within a particular species thus creating a common \"smell map\" within the olfactory bulb.  This type of organization in which sensory modality characteristics are separated out and represented in different places in the thalamus and cortex is seen with other sensory systems such as the visual and auditory systems."))