Nasal passages guide air onto olfactory epithelium {olfactory cleft} at nose back.
Upper-nose olfactory-cleft mucus cells {olfactory epithelium} {orthonasal olfactory system} are olfactory receptors, basal cells, and supporting cells. In mammals, odor receptors are at nose air-passage top or back. In humans, smell regions are four square-centimeters. Olfactory epithelium is mostly small sensory cells {olfactory sensory neuron} (OSN), with cilia that have odor receptors.
Olfactory region is light yellow in humans and dark yellow or brown in animals. Albinos have white regions and typically have poor smell ability.
Chewing and swallowing can send odorant up rear nasal tract {retronasal olfactory system}. People think sense qualities are in mouth. Orthonasal olfactory system is about outside environment, while retronasal olfactory system is about nutrients and poisons.
Inner-nose ridges {turbinate}| channel inhaled air to olfactory epithelium.
1-Consciousness-Sense-Smell-Anatomy
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Date Modified: 2022.0225