Olfaction Flashcards
olfaction = info about ___________
airborne molecules (odorants)
olfaction detection threshold varies _____________________________ but can be up to ____
varies between different molecules and can reach up to 30m
interpretation can depend upon____
concentration
across fibre pattern coding in olfaction means…
the pattern of different cells that are activated by different molecules
where are the sensory receptors located in
the olfactory epithelium
where do olfactory afferent project?
directly to the olfactory bulb in the cns
where are the bipolar olfactory receptor neurones housed
the nasal epithelium
where is the mucous layer produced?
Bowman’s gland
what does mucous do in olfaction?
mucus concentrates the chemicals and brings them into contact with cilia
how long do olfactory neurones last?
6-8 weeks
what does olfaction mean for lower organisms?
seeking and avoidance behaviour
what does olfaction mean for higher organisms
stimulating the GI system, quality of food source, nutritionally beneficial or toxic
why are the cilia embedded in the mucus layer
to trap olfactory molecules and amplify the signal
where are the olfactory receptors
concentrated in the cilia of olfactory receptor neurones
each ORN expresses ___ receptor gene
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