Final answer:
Mitral cells are the cell type not found in the olfactory epithelium; they are located in the olfactory bulb, while olfactory sensory neurons, supporting cells, and basal cells are present in the epithelium.
Step-by-step explanation:
The olfactory epithelium is a specialized tissue within the nasal cavity that houses several types of cells related to the sense of smell. The mitral cells are not found in the olfactory epithelium; however, they are located in the olfactory bulb. Within the olfactory epithelium, one can find olfactory sensory neurons, which are responsible for detecting odorants.
These neurons have dendrites with hair-like cilia coated with receptors that bind to odor molecules. Additionally, the epithelium contains supporting cells that provide structural and metabolic support, and basal cells which are stem cells that can differentiate into new olfactory sensory neurons. The mucous membrane cells produce mucus to dissolve and transport odor molecules to the receptors.
To answer which cells are not found in the olfactory epithelium, the mitral cells would be the correct choice. They are found in the olfactory bulb, not in the olfactory epithelium like the other cell types listed.