PSY100H1 Chapter Notes - Chapter 13: Olfactory Receptor Neuron, Olfactory Bulb, Olfactory Epithelium
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PSY100H1 Full Course Notes
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Humans have 2 main chemical detection systems one for molecules floating in air, and another for molecules that we put in mouths. Another chemical sensing system important for both smell and taste is trigeminal system, innervated by trigeminal nerve. Trigeminal system enables us to feel gustatory and olfactory experiences. Odors and odorants: odors: general smell sensation of particular quality. By contrast, when referring to specific chemical entity, term odorant should be used: odorant: any specific aromatic chemical. To be smelled, molecule must be volatile (able to float through air), small (less than 5. 8 x 10-22 grams) and hydrophobic (repellent to water). Located on both sides of upper portion of nasal cavity and olfactory clefts, olfactory epithelium contains 3 types of cells olfactory sensory neurons, basal cells and supporting cells. Each epithelium measures about 1-2 square inches (depending on size of nose) Supporting cells: 1 of 3 types of cells in olfactory epithelium.