II. Olfaction

• Olfactory cells: bipolar sensory neuron with chemoreceptors
• Supporting(Sustentacular) cells
• Basal cells: stems cells that differentiate into columnar, supporting and olfactory cells
• Microvillus: brush cells
• OLFACTION Receptor: olfactory epithelium
• OLFACTION is located in the upper 1/3 of each nasal mucosa
• OLFACTION stimulated by chemicals they transmit impulses along olfactory nerve to olfactory center in the temporal lobe (uncus – Brodmann’s Area 34)
• olfaction- sense of smell
• odorants- airbone molecules
• olfactory epithelium- lines the superior part of nasal cavity
• mucus- keeps the nasal moist
• there are atleast 400 olfactory receptors
• olfactory neurons have enlarged distal ends with long cilia
• olfactory tract- carry potential from the olfactory bulb to the olfactory cortex