The Special Senses

The Special Senses - Gustation Taste receptors •...

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The Special Senses Olfaction Olfactory organs • Contain olfactory epithelium with olfactory receptors, supporting cells, basal cells • Olfactory receptors are modified neurons • Surfaces are coated with secretions from olfactory glands • Olfactory reception involved detecting dissolved chemicals as they interact with odorant binding proteins Olfaction • Olfactory pathways • No synapse in the thalamus for arriving information • Olfactory discrimination • Can distinguish thousands of chemical stimuli • CNS interprets smells by pattern of receptor activity • Olfactory receptor population shows considerable turnover • Number of receptors declines with age
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Unformatted text preview: Gustation Taste receptors • Clustered in taste buds • Associated with lingual papillae Taste buds • Contain basal cells which appear to be stem cells • Gustatory cells extend taste hairs through a narrow taste pore Gustatory pathways • Taste buds are monitored by cranial nerves • Synapse within the solitary nucleus of the medulla oblongata • Then on to the thalamus and the primary sensory cortex Gustatory discrimination • Primary taste sensations • Sweet, sour, salty, bitter • Receptors also exist for umami and water • Taste sensitivity shows significant individual differences, some of which are inherited • The number of taste buds declines with age...
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This note was uploaded on 11/22/2011 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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