Olfaction

o g y Smell is perceived by bipolar receptor cells in the olfactory neuroepithelium of the superior nasal cavity. The pseudostratified columnar ciliated epithelial cells are located in the region of the superior septum and both superior and middle nasal turbinates. The cilia are organised in 9+2 microtubule arrangement, but lack dynein arms. The receptors for olfactory ligands are of the seven transmembrane domain type.

The second order neurons are in the olfactory bulb. They continue in the olfactory tract.

The pathways terminate in the primary olfactory cortex and the secondary olfactory cortex of the orbito-frontal region (the rhinencephalon). The other cells of the olfactory neuroepithelium are the sustentacular or supporting cells and the basal cells.

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