BIOL 1013 Lecture Notes - Rhinencephalon, Lingual Papilla, Cribriform Plate
1 Feb 2013
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Document Summary
Primary olfactory neurons project through cribriform plate of ethmoid to the olfactory bulb. The olfactory brain is called the rhinencephalon. Olfactory receptor neurons: capable of regenerating (unique in the cns) Global basal cells: source of new orns: odorant recognition in the orn. Detection: odorant binds receptor g-protein ac camp ion channel opening. Desensitization: phosphorylation of receptor by grks or b -arks, or, uncoupling of receptor from g-protein by arrestins, central processing of olfaction. Uniquely, there is no recognized olfactory topographic map, except for evidence that same areas of neuroepithelium project to same glomerulus in olfactory bulb. There are a wide variety of ways hyposmia or anosmia results, e. g. from endocrine insufficiency, mechanical obstruction/damage, neurological problems. There are 3 types of papillae (anterior to posterior): fungiform, circumvallate, foliate. Taste receptor cells are found in taste buds, which are found in papillae. There are no salt regions , sour regions , etc. on the tongue!
