These are thin cellular extensions.
- In olfaction, they extend from the dendritic knob of the olfactory receptor neurons. 

Ohio State University, Columbus

These are cells in the olfactory epithelium that detect chemicals in the air called odorants using specialized receptors. These neurons can be replaced in adults (Costanzo, 1991). 

The olfactory receptor neurons consist of multiple structures that assist in detecting odorants. 

- cilia
- dendritic knob

Olfactory receptor neurons

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

Cilia 

This is a part of the olfactory receptor neurons in the olfactory epithelium. These also contain cilia which are extensions of the dendritic knob. 

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